The other thing is to ask your husband if she has ever had a head injury - been in car or other accident. Injuries to the frontal lobe could cause these type of symptoms and impulse and emotional control issues. Also, people with these injuries also lose ability to relate to others etc.

That is one tough situation My mother says "When you marry a man, you also marry his family."

I do understand your pain. I have problems with my monster-in-law and it is not easy to go around it without causing a revolution in the family.

If all things are taken and it really isn't a medical condition, you should keep your distance and not feel guilty about it. Just do the 6 month obligatory dinner to keep the peace between all parties and move along. With a child on the way, it is important you keep a healthy environment.

What is important is that your husband seems to be supporting you. His parents might be more difficult to convince because parents are sometimes the most obstinate to accept or even consider the existance of a problem with their children.

You sound as if you really care. If so, then NOONE on EF can give an educated diagnosis without having a few sittings with anyone suffering from whatever condition.

Suggestion: Find a qualified person. Tell them what you have published here.
Tell him/her about the delicate situation.
Arrange a meal where she / he will be present to witness at first hand what is happening.
Subsequently discuss it.
Then you can go about the matter in a responsible way.
Good luck.
Whatever, your marriage will benefit, when your spouse observes your care in seeking an improvement
in the quality of lives of his blood relatives.

Custodian, that is an excellent suggestion.