Maybe her house was messy and she was embarrassed. You never know. I agree, it’s a bit unusual, but if he likes her, he’ll have future opportunities to meet her family.
You want first date stories? How’s this one. A friend of my sister’s set me up with a guy. He comes 3 hours late for our first date, telling me his mother needed the car for errands. Bizarre? I liked him, so I agreed to go out again. He spent a good part of our second date talking about a girl we both mutually knew who was married who he was in love with. How’s that for strange??