Lacked of shared environmental influence (C) is not the same as “parents don’t matter.” C is a statistical construct of things that make people more similar, regardless of genetic similarity. Parenting is C only if it has consistent effects across twins/sibs within a family.
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Parenting can easily fall under non-shared environmental effects (E), if it is different (or just has different effects) between twins/sibs within a family
End of conversation
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