Family functioning includes the interactions and relationships, adaptability, organization, and communication of the family environment, and is the foundation for the physical and psychosocial well-being of family members [1,2]. Family well-being, usually conceptualized as “family life satisfaction,” is the keystone of a harmonious society [3]. From a macro perspective, social resources, including income, time, and psychological and social capital, are determinants of family functioning and well-being [4]. Individually, spending time and having quality communication with family members improves family well-being, as this allows family members to connect, achieve fulfillment, and express and share attitudes and values. Higher quality family communication improves cardiovascular health, immune system, subjective well-being, and quality of life [5,6]. Having poor family communication and relationships increase the risks of depression, anxiety, loneliness, substance abuse, and other psychological distress [7,8].

The development of information and communication technologies (ICTs) has largely transformed interpersonal communication [9]. Advanced ICT tools in smartphones, such as voice messages, multimedia messages, and video calls, have facilitated the rapid exchange of information or affect [10]. However, inappropriate use of ICTs has led to a wide array of psychological problems, including decline in the size of social circles and life satisfaction, and an increase in depression and loneliness [11]. Specifically, entertainment usage, especially gaming, is associated with emotional exhaustion, function impairment, and relationship disruption [12]. A poor perceived well-being can also result from a perceived waste of time in excessive smartphone use [13]. Relationship fulfillment is usually acquired from achieving common goals or relating to others. As the most important social tie with effort to maintain, family cohesion and satisfaction require interactions with both high quantity and quality. Under the current busy social context, communication through a smartphone, including phone calls or text messages, has been associated with increased family functioning and well-being, presumably via a positive and effective experience of interactive connection [14-16].

Face-to-face communication has remained the dominant mode of family interaction [17]. Telephone, as a traditional means of remote communication, provides instant feedback across geographical distance. Instant messaging (IM) apps (eg, WhatsApp, WeChat), with access regardless of time, distance, and cost restrictions, may function as better substitutes when face-to-face communication is hard to achieve [18]. We previously reported that more than half of the Hong Kong population used IM for family communication in the 2012 household survey [19]. A higher well-being level was observed among families using smartphones for communication [19]. Long working hours have left little time for family gatherings. The increase in smartphone-mediated communication such as mobile voice and video calls is related to closer and higher-quality relationships, which are in turn related to greater life satisfaction and well-being [20]. IM features help to maintain real-time bonding and bridge social capital, which can facilitate communication for higher perceived well-being [19,20]. A group chat allows for all sources of information to be synchronously exchanged among three or more participants, and is now commonly used among classmates, coworkers, friends, and family members [21]. As a common platform for family life information sharing, an IM chat group can strengthen family management (eg, parenting, childcare) and health information transfer for improving family health [22,23].

Positive communication experiences are critical for the adaptive functioning of family relationships by buffering against family problems and difficulties [14]. Chinese culture values family communication as an important embodiment of family cohesion [24], which is considered to be vital for the family harmony, happiness, and health (3Hs) that underlie family well-being [3,25]. Lack of positive interaction, in conjunction with a stressful work life, can be detrimental to family well-being [26]. In Hong Kong, smartphone penetration reached 88.6% in 2017 and almost all internet users (98.1%) use smartphones for communication [27]. As a new approach for family communication, there is a lack of research to determine whether a family group chat is associated with well-being. Most of the recent studies in this field have focused on IM use among teenagers and adolescents with a small sample size [28,29]; however, IM users are increasing rapidly in all age groups [27]. Therefore, the aim of this study was to examine the associations of family chat group usage with family functioning and well-being in Hong Kong adults. We also tested whether the above associations are mediated by improved quality of family communication.

Of the 1638 respondents, just under half were men and the majority were aged 25 to 64 years. Most of the respondents were married or cohabitating, attained secondary or higher level of education, and had a monthly household income of more than HK $30,000 (Table 1). Almost all respondents communicate with family members (98.6%, 1341/1360), with the great majority often communicating face-to-face. Bivariate analysis showed that respondents of female sex, younger age, married or cohabitating, with higher education, higher income, better family functioning, and better well-being were associated with having at least one family IM chat group (all P<.01). The frequency of family face-to-face communication was not associated with the use of family IM chat groups (P=.14).

Most respondents (72.0%, 1180/1638) had at least one family IM chat group. Among those who have family IM chat groups, 92.0% (1083/1177) and 83.7% (987/1179) of the respondents received and sent at least one message daily, respectively (Table 2). Compared with having no family IM chat groups (n=458), having 3 family IM chat groups was associated with higher mean scores (Multimedia Appendix 1), and was significantly associated with a higher FCS level (mean 37.3 vs 39.5), family APGAR (mean 5.4 vs 7.0), and family well-being (mean 7.1 vs 7.8) controlling for sociodemographic factors (Table 2). Respondents with more family IM chat groups and who received or sent more messages in family IM chat groups were positively associated with a better quality of family communication, family APGAR, and family well-being with dose-response associations (all P for trend <.001). More frequent IM chat interactions (received and sent messages combined) was significantly associated with increased FCS, family APGAR, and family well-being levels compared with those of respondents reporting no use. The associations remained robust after additionally adjusting for the frequency of family face-to-face communication (Table 2).

The effect of a greater number of family IM chat groups, received messages, sent messages, and chat interactions (received and sent messages combined) on family functioning and family well-being was largely attenuated after adjusting for FCS (Table 3), providing support for FCS as a mediator. A significant mediation effect of FCS on the above associations (P for Sobel test <.001) was found independent of the frequency of family face-to-face communication. Family IM chat interaction accounted for 23.0% of the total effect on family APGAR, and 59.6% of the total effect was mediated by FCS. Similarly, FCS accounted for 51.0% of the 18% total effect of family IM chat interaction on family well-being (P for Sobel test <.001).

To our knowledge, this is the first study to report the associations of family IM chat groups with family communication, functioning, and well-being. Family interaction has been strongly associated with family relationships and well-being [5,39]. Our findings are in line with previous findings on the use of IM for family communication predicting greater positive relations and well-being [19]. Three-quarters (73.3%) of the respondents had at least one family IM chat group and almost all (93%) of the family IM chat group users received or sent at least one message daily. Respondents with higher education levels, higher household income, and younger age were more likely to use IM for family communication, which might be explained by their higher accessibility and acceptance of new ICTs [19]. The associations remained robust after adjusting for sociodemographic factors and the frequency of family face-to-face communication. Having at least one family chat group was significantly associated with better family functioning and well-being. A dose-response effect of having more family chat groups was found with better family communication and relationships, in concordance with the Chinese “big family” concept, which values the togetherness, cohesiveness, and harmony of the family over individual expression [40]. The adoption of family groups also responds to a deep cross-cultural need to strengthen and maintain family intimacy, and to establish a coherent identity, especially with geographically separated families [40]. Although the information on which family members were included in the family groups was not collected, our results indicate that setting up family chat groups may increase family cohesion and impose a better family relationship.

The number of messages received (21.9% received over 10 messages daily) exceeded the number of messages sent (8.0% sent over 10 messages daily), likely because messages sent in group chats were received by more than one recipient. Respondents with frequent group interaction might have more concerns over family issues, be more eager to share family life information, and have better management of family relationships, thereby improving family well-being [14]. Prior studies have reported that traditional methods of communication (face-to-face and phone calls) were strongly associated with family well-being [19,22]. Increasing reliance on ICTs in recent years has changed and continues to transform the ways families interact, exchange information, and communicate [41]. The steep growth of IM users and the proliferation of IM app features (eg, video calls, file transfer, news sharing, emoji) have provided the most convenient communication ecosystem for society as a whole [16,29].

The association between family group chat and family well-being was partially mediated by quality communication. Maintaining family well-being is increasingly challenging in modern societies with busy lifestyles, long work hours (Hong Kong residents work an average of 45 hours a week), and poor work-life balance [42]. People who can utilize effective communication to maintain harmonious marital and family relationships are often healthier and happier than those who are in turbulent family relationships [39]. IM chat adds no time demands for gathering, and may provide opportunity to balance work and life conflicts. Group chats simulate a gathering environment where users can effectively share family information, deal with family problems, and provide support, even from a far distance. Our results, if confirmed by prospective data, could provide solid evidence that the use of family chat groups should be encouraged, especially under a busy society context.

Although specific information topics shared in family groups were not determined in this study, IMs in family chat groups may tend to be tailored to the needs of families rather than to individuals as compared to one-on-one conversations. Family members might be more inclined to share positive family information, express concern and affection, and to respond to and resolve personal or family problems in the chat groups, which are considered the main aspects of family communication quality, and are closely associated with strengthened family bonds and psychological support [39]. Gratitude and happiness expressed during family activities are positively associated with family communication and well-being [43]. Using a synchronous communication platform, IM group chat could facilitate family information exchange [22], thereby contributing to improved family functioning and well-being. Future qualitative studies may consider capturing the detailed content of the group conversation that contributes to family functioning and well-being for guiding quality family communication.

Many studies have focused on adolescents or young adults with respect to the use of IM and well-being owing to their higher tendency of use [44]; however, a huge growing trend among adults and elderly users of IM also requires research to understand the possible individual and family implications [45]. In this sample of Chinese adults, almost half (45%) of older adults (aged 65 or above) had no family chat group. One explanation is their perceived and practical access barriers to new technologies [46]. Lack of cognitive skills, information literacy, and social support in the elderly are also responsible for communication inequalities in a digitally dense society [46,47]. We found no interactions between the younger (aged 18-64 years) and older (aged over 65 years) adults on the association between family IM group chat with family communication and family relationships (see Multimedia Appendix 2), suggesting that communication with family members through chat groups equally improved perceived family relationships in the elderly as in the younger adults. Loneliness, isolation, and suicide attempts are invading the psychological health of the elderly, representing a huge public health concern [48,49], especially for aging societies such as Hong Kong [50]. Involving the elderly to use ICTs to communicate could be practical and effective in maintaining family connection; preventing family and social life isolation; and sustaining a higher level of mental, family, and social well-being.

This study has several limitations. First, landline telephone directories were used to sample the potential respondents, which excluded families with only mobile phones. Our recent landline and online (randomly sampled from a population-representative mobile panel) survey found similar characteristics in terms of sex, age, socioeconomic background, and information seeking [51]. Mobile phone and online surveys are therefore needed to complement the findings. Second, recall bias in reporting the number of family chat groups, and messages received and sent in the groups daily could not be excluded. Third, due to the cross-sectional survey design, we cannot rule out residual confounding or reverse causality. Therefore, prospective studies are needed to further confirm the associations and test for the mediation effect we observed. Indeed, families with better family relationships might tend to use IM group chat more frequently to maintain contact. Nevertheless, the association remained robust after controlling for the frequency of face-to-face communication. Most studies on IM use have focused on teenagers and adolescents owing to their higher acceptance of new technologies and lower self-control to behavioral addiction. We used simple measurements for the use of family chat groups, and the content of messages was not assessed, which warrants future investigation. We only investigated the adult population, who have more concerns and tend to pay much more attention to family relationships; thus, whether the family IM group chat equally benefits the younger generation remains unclear. Family health, harmony, and happiness have been identified as determinants of family well-being in Chinese culture [3,25]; however, the perceptions of family well-being might be different in other countries, which affects the generalizability of our findings. The validity of family well-being was indirectly supported by the consistent results with the FCS and family functioning scale, which are validated scales frequently used in Western countries.

In summary, family IM chat use was associated with higher family functioning and well-being, and the association was partially mediated by family communication.