Earlier quoted context omitted.
> There's little solid evidence for inherited mental illness A quick web search seems to suggest that ADHD, depression, and autism are all known to run in families?
https://news.ycombinator.com/item?id=33624032 > (8) Family genetic studies . The phrase “family genetic studies” is commonly used in psychiatry to refer to designs in which investigators examine the familial aggregation of one or more disorders, such as panic disorder or major depression, within intact (i.e., non-adoptive) families (e.g., Weissman, 1993). Given that the familial aggregation of one or more disorders w…
> Even schizophrenia, which is among the most heritable of all mental disorders, appears to have a heritability of between 70 and 90% as estimated by twin designs (Mulle, 2012), leaving room for still undetermined environmental influences.
You have set the bar high.