Thesis advisor: Thomas M. Crea / Thesis advisor: Ruth E. Prado P. / Undocumented Mexican immigrants and their children make up a considerable proportion of the United States population at risk of mental health problems. Yet research to inform the mental health of undocumented Mexican immigrants and their children is very limited, and the majority of existing studies are qualitative; both types of studies are needed to understand better the relationship among different factors that may influence the mental health of immigrant parents and their children. This three-paper dissertation analyzed the implications of parents’ and children’s immigration status for the mothers' mental health and the children’s behavioral problems. It utilized subsamples from the Los Angeles Family and Neighborhood Survey (L.A. FANS), a survey representative of Los Angeles County, which includes direct measures of respondent’s immigration status. Paper 1 used path analysis to examine the relationship between the mothers' immigration status and major depression, and whether self-efficacy served as a mediator. Surprisingly, undocumented mothers had fewer symptoms of major depression compared with Mexican American and documented mothers. However, when self-efficacy mediated the relationship, immigration status lowered self-efficacy, increasing symptoms of major depression. Paper 2 used hierarchical regression analysis to examine the associations of mother’s and children’s immigration status with children’s behavioral problems. Immigration status was significantly associated with internalizing problems, but not with externalizing problems. For children in mixed-status families, the influence of immigration status on internalizing problems was more severe for children in middle childhood compared to children in early childhood. The influence of immigration status on internalizing problems was more severe for adolescents compared to children in early childhood and middle childhood. Also, the mother’s self-efficacy ameliorated the negative influence of immigration status on children’s behavioral problems (internalizing and externalizing) for girls in undocumented and mixed-status families. Finally, marital conflict exacerbated the negative effects of immigration status on children’s behavioral problems (internalizing and externalizing) for girls in undocumented and mixed-status families. Paper 3 utilized path analysis to examine the mediating role of mother’s mental health (e.g., major depression and self-efficacy) and parenting stress in the relationship between immigration status and children’s behavioral problems. It was found that immigration status influences the mothers' mental health and parenting stress, which in turn influences the behavioral functioning of children in middle childhood and adolescents. Results of these three studies will help inform practice and policy by addressing critical gaps in the literature impacting a growing number of undocumented immigrant mothers and their children. / Thesis (PhD) — Boston College, 2018. / Submitted to: Boston College. Graduate School of Social Work. / Discipline: Social Work.