Grandparent support moderates the relation between socioeconomic status and children's cognitive development.

Grandparents support American families in many ways, but they have often been overlooked in research on typical families (e.g., parents raising children). We examined whether grandparents have a positive influence on children's development by buffering the relation between parents' socioeconomic status (SES) and children's cognitive development. Parents ( = 437) from 45 U.S. states reported on 1,047 grandparent relationships with their 3- to 5-year-old children ( = 4.18 years) and how helpful grandparents are regarding financial, instrumental, emotional, and informational support, which were summed together across all grandparent relationships. We found that SES (a composite of family income and parents' average education) was significantly related to preschoolers' cognitive development (a composite of receptive and expressive language, literacy, and numbers). However, this relation was weaker when grandparents provided a higher level of support. Most families received grandparent support of basic child needs (e.g., clothing) and educational resources that could contribute to children's cognitive development (e.g., books). Grandparents provided greater financial, instrumental, emotional, and informational support to parents when they were emotionally close to the grandchild and interacted frequently. However, only emotional support was related to the geographical distance to the grandchild. These results suggest that even in parent-led American families, grandparents play a supportive, buffering role against the potential negative effects of lower SES on children's cognitive development. (PsycInfo Database Record (c) 2025 APA, all rights reserved).