He plans on asking his 75 year old mother (and she’ll be older by then) to take care of his future children? Really? It doesn’t sound like he wants to take care of mom. He uses mom now living rent free and in the future she’ll be free care giver? In her advanced age?

He doesn’t sound like marriage material. Why single man with no kids live with his mom? Single adults with no minor children should be able to support themselves and not counting on mommy dearest. Red flag

All if this talk about her moving in is a moot point. He has no place to move mom into.

I’d move on and not look back. He isn’t a marriage material