Mental health problems are estimated to be the most common disabling condition among adolescents worldwide, with children growing up in socially disadvantaged homes having up to three times the risk of mental health problems compared to children without such disadvantage. Studies show a high degree of intergenerational stability in these patterns, with social stressors putting particular subgroups of children at higher risk from the earliest stages of development. Immigrant and refugee children make up a significant proportion of the BC child population, and have a unique set of circumstances that may increase or decrease their risk of mental health problems as they reach adolescence. In BC, an established system of child development monitoring paired with new data linkages to provincial health, immigration, and Statistics Canada records create a globally unique opportunity to investigate continuities from maternal mental health problems to childhood emotional symptoms and adolescent mental health problems, for immigrant, refugee, and non-immigrant children. The purpose is to identify opportunities to break these continuities, informing the timing and design of preventative interventions to promote population mental health.