The Collaborative HIV Prevention and Adolescent Mental Health Project (CHAMP) Family Program is a 12-week, family-focused, developmentally timed intervention for 4th- and 5th-grade students in urban, low-income communities. CHAMP is guided by a developmentally focused theoretical model informed by an amalgam of prior literature. Briefly, the model posits that at preadolescence, youth are exposed to “situations of sexual possibility” (i.e., unsupervised heterosocial interactions occurring in a private place) but are not yet sexually active, making this age a key intervention target to promote a delay in sexual onset.