According to the research to date, for most personality characteristics one would expect

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Research suggests that biological siblings are more similar than adopted siblings for most personality characteristics. This is likely due to shared genetic material and environmental influences within the family. Adopted children often show some similarities to their adopted parents, but not to the same extent as biological children. There is no evidence to suggest that males are more similar to one another than females for personality characteristics.

According to the Research to Date, for Most Personality Characteristics