Basically my fiancées dad is the definition of a narcissist, jealous of everything and unbelievably controlling of his wife and children who are all adults with their own lives. I've tolerated him for my fiancées sake. My concern at the moment Is that his wife has finally realised how toxic he is after 30 years and now she's trying to get away from him. Obviously in typical narcissism fashion he is now pretending to be suicidal to try manipulate his wife from moving out. "I've had loads of alcohol with loads of sleeping pills" surprise surprised he is still alive with no side effects. Two week ago he put in the family group chat "just think a big dose of insulin" aimed towards his wife to make her feel bad, (he is a type 1 diabetic and too much insulin can kill you) I was disgusted with this comment especially since my son, his own grandson also has type 1 diabetes. So I've decided for the time being to keep my son away from him as I don't want my child around that type of behaviour. The reason I need to know if AITAH is because all his children and wife are just brushing it off as if it's normal behaviour and not a big deal.

Update- My fiancée is having second thoughts on the matter as she has more family in that area and says she can't stop her dad from going into their houses when our son is their. Any advice would be appreciated.