No knowledge is certain and all knowledge is always contingent. Social sciences and psychology are particularly weak in terms of reliability of findings and replication. So take it with a pinch of salt, but this is an interesting list of the most replicated findings in behavioral genetics.
Finding 1. All psychological traits show significant and substantial genetic influence
Finding 2. No traits are i00% heritable
Finding 3. Heritability is caused by many genes of small effect
Finding 4. Phenotypic correlations between psychological traits show significant and substantial genetic mediation
Finding 5. The heritability of intelligence increases throughout development
Finding 6. Age-to-age stability is mainly due to genetics
Finding 7. Most measures of the "environment" show significant genetic influence
Finding 8. Most associations between environmental measures and psychological traits are significantly mediated genetically
Finding 9. Most environmental effects are not shared by children growing up in the same family
Finding 10. Abnormal is normal (Quantitative genetic methods suggest that common disorders are the extremes of the same genetic factors responsible for heritability throughout the distribution.)
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