Halevai. But student visas cannot enter.
That’s why a general psak is confusing, did they give up the lease or didn’t they?
Are they allowed to come back or not?
Who’s name is on the lease? If it’s the parents, than we can argue that their children living there were somewhat of a sublease, and we can tell the parents to find someone else to put in there, but they have to pay anyway.
I’m not a dayan but these could be valid differences.