Haha~~~ It’s mainly because we are closer and familiar with that daughter-in-law, or that daughter-in-law’s name is easier to remember and catchier for the elderly
Duohe If the old man chats and spends time with good people, things will get better naturally. Don’t worry about it. It doesn’t matter what you call him.
I have lived in school, worked, and had a family in other places since I was a child. Once I come home, my mother often calls my sister’s name, and I agree with a smile every time. Later, I got better, hehe