In this paper, we summarize the results of the two-year, National Science Foundation-funded Head Start on Engineering (HSE) project, designed to study and support engineering-related interest development for preschool children and their families from low-income backgrounds participating in Head Start. Low-income communities face ongoing barriers to accessing STEM learning resources and pursuing STEM-related careers. Quality family interventions in early childhood are a critical approach to addressing these barriers and have been shown to have long-term, positive impacts on families well beyond