Tbh, I do think the only cruel things he did was telling a people to die..
╮( ̄▽ ̄)╭
But abandoning/forgetting his family? The fact that he was the one who is money maker in the family is already show that he did care. Doesn't the treatment process for cancer patients is expensive too?? And working with big project, especially music, is also demands so much time.. Just because he's genius doesn't mean that he can't feel tired and stressed inside..