I think he is introvert and uncomfortable way before he was married. Well, since you lived 10 mins away, there is always another alternative. Your daughter and granddaughter can go over to your place as part of their lifestyle too. He can have the house to himself and perhaps this way, one day, he will realize the gap he caused through the silence in the house. I don't know.

I mean, please do not label yourself as MIL from Hell. I don't see him as son-in-law from hell. I don't see you as mom-in-law from hell either.