@Momto4,
You're not the mother though. When you've raised two kids single handed on your own for ten years without a mother it can get a bit much when a woman thinks they can just step in, especially during a crisis. You were asking questions the kids mother would ask, but he's brought them up without a mother.
If he's brought them up on his own for ten years it doesn't sound like he, (or the kids,) needs a mummy figure.
Single fathers face prejudice with some people thinking they can't cope, just because they're a man.