If it was her father, he would never leave before the boy made himself scarce, but the mom is the opposite. I guess that's how it goes, as long as the mom judges the boy decent and honourable. Of course if those two actually started going out officially and the dad accepted it (no matter how grudgingly), then he might be barely willing to leave them alone.
Roji would start hating him if he didn't give them some space.I feel like it's the opposite he would never leave them alone once they start dating.