Sounds like he knows what he’s doing. Your approval and apparently the entire family IS important. Horrible when one’s choice for a life partner doesn’t get along with in-laws.
And both being PhD candidates, should well be able to take care of themselves financially, and certainly to get there they have to have a good sense of self-discipline and maturity. So it’s all good.
Congratulations and best of luck to your son and his (sound like soon to be) fiancee!!
Thank you, Edinva!