Crazy People....litterally.

I have just been informed that Father's wife is now suffering from multiple personality disorder. This is supposed to be an explanation for her behavior and not an excuse for it.
Apparently Father has been to the doctor with her and this is an actual diagnosis. The thing that I find to be most interesting is that she doesn't display and alternate personality. She just displays her current personality with an aggressive tendency. I don't think that qualifies as an accurate disagnosis, but I am not a trained psychiatrist so I must not know what I am talking about.
I find this whole situation to be both sad and pathetic. I don't know how he could possibly believe all of this, but somehow he has. He doesn't realize how close he is to losing his whole family. He is content to deal with her crazy ass with absolutley no regard for the rest of us. I just hope he is happy with her or should I say them.