I had to post this interesting article I stumbled upon in my Twitter feed regarding genes having a lot to do with explaining why parents are particular about husband / wife / partner.
The crux of the finding based of a study
Evolutionary theory suggests that parents and their daughters (and sons, for that matter) should both want a caring and supportive mate. That would work for all of them. And they do both strive for this. But parents, apparently, want it more.
So perhaps now you can explain why your parents behave the way they do during that introductory dinner.