With my MIL I realised fairly early on that I wasn't good enough for her son and she has made that clear over the last 30 or so years that she wished he'd married his previous GF. I agree it's jealousy , and a reluctance to renounce control as the queen bee. I stopped visiting my MIL ( now 96 and even more cantankerous) a couple of years ago after , when we were hosting her to dinner as we did once or twice a week, she blew up after I said she shouldn't be rude to shop assistants ( another story) and she let me have both barrels. I then decided not to have someone in my home who verbally abused me, and now I only see her when in a family occasion when I can avoid talking to her. My OH supports me, but has to do the running around after her with his sister and not me. I would help in an emergency, obviously, but I am not willing to interact with someone who is so hostile and has never tried to apologise.