Abstract
Differences in age and number of children tested per family between two ethnic groups (Americans of Japanese ancestry and Americans of European ancestry) have a trivial effect on differences in regressions of midchild on midparent for tests of specific cognitive abilities. Although the regression of offspring on midparent value is not a mathematical function of the spouse correlation, an empirical association between these two measures of familial resemblance is expected for characters with nonzero heritability. Such an association is reported for anthropometric characters. Since age effects contribute to the covariance of family members, age correction of family cognitive data is essential.
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