The literature is divided on the issue of what matters for adolescents' well-being, with one approach focusing on quality and the other on routine family time. Using the experience sampling method, a unique form of time diary, and survey data drawn from the 500 Family Study ("N" = 237 adolescents with 8,122 observations), this study examined the association between family time and adolescents' emotional well-being as a function of the type of activities family members engaged in during their time together. Hierarchical linear model analyses revealed that eating meals together was beneficial to adolescents' emotional well-being, especially when fathers were present. Family leisure was also beneficial to teens' well-being. By contrast, productive family time (e.g., homework) was associated with lower emotional well-being, as was maintenance family time (e.g., household chores), but only when adolescents engaged in it with both parents. (Contains 4 tables and 1 note.)