Project Summary During the COVID-19 pandemic many families are using video chat (e.g., Zoom) to maintain relationships with distant relatives, including grandparents. While 67% of all grandparents reported liking the idea of video chatting with their grandchildren, only 28% did so regularly. Increasing this percentage could significantly improve grandparent-grandchild relationships because our Preliminary Study 1 showed that video chat frequency is a strong predictor of grandparent’s ratings of closeness to their grandchild, even after controlling for the geographic distance between them. The overall goal of our past, ongoing, and future research is to understand the cognitive and social developmental challenges of video chat in order to support its use with children. As the next step towards this goal, we propose to directly compare two approaches to instructing grandparents on how to improve video chats between grandparents and young grandchildren (18-72 months of age). Families will use video chat without the involvement of researchers during each video chat. Parent-child- grandparent triads (n=180; the largest multi-session observational study of young children and video chat to date) will record 10 video chats under one of three randomly-assigned conditions: structured play, structured reading, or when given no instructions (control). Our overall hypothesis is that structured video chat will increase children’s engagement and joint attention (primary outcome measures), as well as grandparents’ enjoyment of video chat and closeness with their grandchild (secondary outcome measures). We will use detailed behavioral coding of the video recordings of these chats to objectively assess many of the outcome measures. Our Preliminary Study 2 showed that structured video chat facilitates more positive social interactions. The proposed work extends our preliminary work because it translates our laboratory methods to a complementary ecologically-valid approach in families’ naturalistic environments. In Aim 1, we will determine whether and for whom structured video chat improves child engagement and increases child-initiated screen- based joint attention during video chats between grandparents and grandchildren. In Aim 2, we will determine whether structured video chat increases grandparents’ enjoyment of the video chats and leads to greater feelings of closeness to their grandchild. PI Myers and Co-I Strouse, who are both at R15-AREA-eligible institutions, are well-qualified to complete the proposed work. Since 2017, they have published 9 papers on video chat, 12 papers on reading, and collaboratively completed 3 preliminary studies and 2 papers. They have mentored 77 undergraduate students, many of whom were co-authors on conference posters or presentations (37; 22 as a presenter) or journal articles (12). Importantly, 17 students came from underrepresented groups (BIPOC, first- generation in college, LGBT). A total of 47 are pursuing or have complete...