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In a representative urban sample of 248 children, years of schooling of both parents showed an increasing relationship to their son's and daughter's IQs between 21 mo. and 15 yr. The parent-child correlation was observable and became statistically significant for girls by 3 yr. but not until 5 yr. for boys. Earlier parent-daughter resemblance was also noted when ratings of mother's intelligence and social status were correlated with the children's scores. Siblings' IQs yielded comparable sex differences in relation to parents' education. This finding was further confirmed in the correlations of the IQs of a 2nd generation sample with the IQs of the parent in the original group at age 15 yr. A sex difference in rate of mental growth is suggested as the major determinant of these results.