How would it make you feel if a guy kept asking personal questions about your mother?

I went on one date with this guy last weekend. Yes he was nice at first but he started asking me a lot of personal questions about my relationship with my ex ( which I kinda understand I guess) and about my mother. Mom and I are close, we share a house and she has health problems so I take care of her. And on top of that I mentioned on the date that I was taking my mom to a free concert and fireworks show. He invites himself to go to the concert with us (which I said no to because I only went on one date with him, I didn’t know him well enough and I knew that would make my mom uncomfortable). The night after the date he’s asking me all of these questions about my ex: how long did you date for? Why did the relationship end? What did you find attractive about him? Etc, which I felt a little uncomfortable answering but I answered anyway. That ex hurt me and I figured maybe he just wants to be sure he doesn’t repeat what the ex did, so I answered. Then he’s asking me things like how old is your mom? I asked him why and he said “well your mom is an important person in your life and I can tell that you’re really close, so I want to know more about her” (again no big deal, but he could have asked me things like “what’s she like?”, “who’s her favorite actor?”, “what music does she like?” Etc) but instead he’s asking me personal information like her name, age and date of birth. And how she was enjoying the concert (which would have been fine without the other questions)

It was making me really uncomfortable. She heard him ask that and was also uneasy. I told him that it was a little bit weird he was asking me for that information. I told him it was a bit weird and he got defensive. What would you guys think?

Updates
10 mo
I’ve just never had any of my exes or anyone I’ve been on dates with ask me questions like that about my mother. I’m only asking because I usually have a tendency to look back and second guess myself after situations. Would you think this is weird too or was I overreacting?
How would it make you feel if a guy kept asking personal questions about your mother?
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