This project is an informal STEM intervention that combines partnerships between STEM and education faculty at the University of Houston with mentorship from the participants’ families and STEM undergraduate mentors to provide hands-on STEM experiences to fourth and fifth-grade students of color. The project aims to increase awareness of and interest in STEM careers and broaden participation in STEM careers. Program components include hands-on activities that engage students with technology through the engineering design process that are led by undergraduate STEM mentors who also are from groups underrepresented in STEM careers; Scientist of Week, which exposes students either to a STEM pioneer from underrepresented groups or a STEM professional from an industry partner; the math problem of the day; and an end-of-year interactive STEM fair, during which students demonstrate their knowledge to larger audiences from their schools and communities. The research questions that guide this mixed-methods project include: 1) What strategies help conceptualize STEM knowledge in a manner that affirms students’ racial identity and cultural ways of knowing? 2) How do students’ STEM identity and awareness of and interest in STEM change over time? 3) How do families engage in their children’s STEM learning in out-of-school STEM communities 4) What motivates STEM undergraduate students to become mentors, and what roles do they enact and why?