Top 10 Replicated Findings From Behavioral Genetics - Robert Plomin, John C. DeFries, Valerie S. Knopik, Jenae M. Neiderhiser, 2016

http://journals.sagepub.com/doi/full/10.1177/1745691615617439

Although environmental effects have a major impact (see Finding 2), the salient environmental influences do not make siblings growing up in the same family similar. The message is not that family experiences are unimportant but rather that the relevant experiences are specific to each child in the family.

_- Steve