Cudaspaz couldn't be more right when he said you should never base your happiness on someone else. That sets up the relationship for failure, it will be doomed.
I think it was ramcharger that said that.
I think this whole situation depends on the girl involved and how much respect (she) has for her Parents with all the pressure she's under from her b/f.
If you're 18 don't be shocked when/if Daddy rings your bell if you don't back off a bit with the whole "under my Parents shoe" and " she can never make a decision on her own" bullcrap.
All that kind of talk does is scream selfishness, immaturity and sets yourself up for a slip and fall session with her Dad in the driveway unless you ease off with the "I wanna call the shots" bullcrap cause Dad will only put up with so much of that, believe me and go ahead and disrespect her Mother some more because it's one thing to be pushy but it's a whole different ballgame when Dad hears you disrespecting his Wife...oooohh boy you better watch yo' step Son.