Dinny,
What a terrible thing for your father to do. It does sound like a way to assert control which is such a big issue with N's.
My mother felt very competitive when my sister and I started dating. She had always been the family beauty and was constantly trying to let us know that our admirers were secretly admiring her more. And if a particular boyfriend didn't seem impressed by her she'd immediately start putting him down. Too short, too thin, funny shoes...it didn't matter, the criticism wouldn't let up until it was much easier just to never bring anyone home.
I was lucky to have a father who, while he didn't stand up for us, at least was accepting. It must have been devastating to feel threatened by your father that way.
In retrospect I think part of the reason I gained weight upon returning to my hometown was to subconciously let my Nmother know that I wasn't in competition with her. But it didn't matter; the competition is in her mind, not mine so I have no way to end it. That was very hard for me to learn. I think I must have some control issues too, now that I think about it.
Singer