We've thought we were going to hear about this several times before, but didn't.
She's a fine young woman who we like very much, loving and tolerant of my son's many eccentricities.
Apparently - according to her - her parents are very much like my in-laws were; they fight and argue all the time. They're nice to my son, however, which is all I care about.
We initiated the contact with them by sending them flowers for Passover. (This confused them.) It was just my wife exhibiting her enormously sweet personality. (She is, however, freaking out about the restaurant prices.)
I have the same rule my parents had; I keep my mouth shut about my feelings with respect to my son's lovers. The only exception was when my father met my future wife and took me aside, within minutes, to tell say, "You should marry that girl." I'd only been living with her for about a month at the time.
When he said that I told him more or less to mind his own business, but eventually I took his advice, which worked out great for me. I'm still madly in love with her, decades later.
After I married my wife, my father came to visit us, and apparently downloaded his opinion to my wife of every girlfriend I'd ever had and what he and my late mother thought of them. It was all new to me. I appreciated him having kept his mouth shut when I was young.
I will say I had negative views of a few of the women my sons dated, but said nothing about it. I would have tried my best to love them had they become daughters-in-law. Happily they didn't.
I won't have a problem if my son marries this woman though. She's very nice, despite what she says about her parents.
Only once did my parents meet one of my girlfriend's parents while I was just dating her. It was a disaster, but the relationship survived for a while but petered out, having nothing to do with my parents antipathy to her and her parents. I was 19; she, 17. I thought I was in love, but had not even a faint idea of what love really was. One can be happy one's dreams do not come true.