He sounds unstable or at least very threatened by something.
Does the girl not drive?
OP, you said that the father isn't allowing them to get married until your son graduates. I think that's absurd.
They're adults, not teenagers. What makes him think that his daughter and your son will still want to marry when he is done with medical school?
That's a long time away and a lot of things can happen... Maybe he really doesn't want them to get married?
Odd story.

OP, you said that the father isn't allowing them to get married until your son graduates. I think that's absurd.



