I am reading Einstein's biography and came across something fascinating: his second son had schizophrenia. The few people I have mentioned this to were aware of this already, so maybe this is not news to you either. But it did surprise me. I know his wife had mood disorders but he himself did not have any serious mental illness. Yes, he was the absent-minded professor, living and breathing physics, not very much into his looks, but that's about it. But it just points to the complex genetics of schizophrenia. Einstein himself apparently thought that the son inherited the genes from his wife. Oh, I forgot to add that Einstein was seen as insensitive by some people around, and there are some speculations about possible theory of mind deficits.