He needs to ask his adult children before proposal!

It's not flippant he wouldn't travel to ask that and be flippant.
Relationship great but I'm not impressed with this decision given how they have treated him in the past. They only take get in touch Christmas and birthdays. It's like giving some power when it's not needed, it's also making me awake!
Also I want to be asked and then tell them, seems the wrong way round.
I and he know they'd approve because I'm the one with the house in my name and they'll think there's something in it for them. (They won't be cos I'd make a decent will)

I'd take it as flippancy.
If you're sure it's not a joke, tho, it is a bit odd.

It is as sweet as a man asking for the father of the bride for her hand in marriage

(Sarcasm off)

How is your relationship otherwise?

He'd say it's the right thing to do.
He's always saying to his DD we are ok aren't we like needing approval.
I don't understand why his happiness needs to be rubber stamped. Like I'm secondary in this decision.

Run for the hills. Don't look back.