Research indicates that mothers of children with ID who receive familial support experience less stress than those who receive less support. Less is known about the relation of support to mothers' evaluation of parenting self-efficacy, particularly in Latino families. We examined the relationship of different types of family support to life satisfaction and parenting self-efficacy (PSE), and explored whether income and ethnicity moderated these relationships. Interviews with 84 Latino and 37 White participants revealed that partner emotional support predicted life satisfaction and PSE in both ethnic groups, with a stronger relationship evident for the PSE of Latino mothers. Income was not a significant moderator. These findings provide guidance for more effective family interventions targeted toward Latinos.