There is a recent Nature paper that uses a "relatedness disequilibrium regression" [1] that claims to show that twin studies overestimate heritability [2] [1]

There is a recent Nature paper that uses a "relatedness disequilibrium regression" [1] that claims to show that twin studies overestimate heritability [2] [1] https://www.nature.com/articles/s41588-018-0178-9 https://www.nature.com/articles/s41588-018-0178-9 [2] https://geneticvariance.wordpress.com/2018/08/13/relatedness-disequilibrium-regression-explained/ https://geneticvariance.wordpress.com/2018/08/13/relatedness...