In family studies of heritability, the portion of group variability that is NOT attributed to heritability is attributed instead to

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The portion of group variability that is not attributed to heritability in family studies is attributed to environmental influences. This includes both shared environmental factors, such as upbringing and family environment, as well as non-shared environmental factors, such as experiences unique to each individual. Random unsystematic variations may play a role in this, but they are not the primary factor. Personal volition and unknown psychical forces are not relevant to the study of heritability.

In Family Studies of Heritability, the Portion of Group Variability