Perhaps you have a friend who could spend a little time at your home the next time she/they are there?
Perhaps your daughter or girlfriend of one of your son's could maybe watch the two of you interact??
???
My sister didn't like a guy I was dating. She talked to me about it very frankly. Her concern was whether or not I was serious about him or not. If not, then she would just pretty much ignore him/put up with him until I moved on. If I really was serious about him, then she said she would put forth energy to get to know him better and find a way to get along in case he would eventually be joining our family.
I dumped him shortly after that. But the conversation was interesting. It encouraged me to move on. I don't know what would have happened if I really was serious. Crazy to think how that would have played out.
-Aude.