Abstract
The genetic and environmental origins of individual differences in adults' ratings of their current family environment have not previously been studied. An abbreviated version of the Moos Family Environment Scales (FES) was completed by 50pairs of identical twins reared apart, 92pairs of identical twins reared together, 129 pairs of fraternal twins reared apart, and 115 pairs of fraternal twins reared together. The average age of the sample was 59 years. Maximum-likelihood estimates of model parameters indicated that, on average, about 25% of the variance of adults' scores on the FES is due to genetic differences among them. Of the eight FES scales, CulturalIntellectual Orientation showed the most genetic influence (40% heritability) and Achievement Orientation showed the least (12% heritability). Reared-together twins were no more similar than reared-apart twins, suggesting that the environment in which they are reared has little effect on adults' ratings of their family environment.
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