This mother has got this son exactly where she wants him, and she's not letting go. That nonsense about her being hurt because of you not greeting her upon arrival was a case of her marking her territory. She was letting you know that she runs the show (of his life.) Momma and Sonny are a package deal. To get to him you literally have to go through her. That would never change. Those two are in a very stable relationship. She may actually want a potential daughter-in-law, but only on her terms. That means she gets to control two people, instead of just one. I think you dodged a bullet.

Incidentally, his weird relationship with Momma is what's driving his substance abuse issues. That's his llittle way of rebelling and depriving her of total control.