Maybe she’s just trying to teach her daughter her own sense of humor. Fathers do this with sons all the time. And I will bet that many readers/commenters here can picture a scenario where the mother is the butt of some lame wisecrack from dad.
If there is one positive memory my brother and I share of our father, it is his completely cornball, what would today be called “nerdy”, sense of humor. He loved old time comedy acts like Laurel & Hardy, Abbott & Costello, and the Three Stooges. The benefit to my brother and me is that when we tell a real groaner, we can blame it on dad. It’s especially valuable if the other brother is around to vouch for the offender’s tale. Like @ family events.