Jen If I let someone have the keys they would know. If I properly demanded it comes off, then they would have to unlock it - because if they didn't I'd get help straight away and that could get difficult legally for them. And that is their consequence to deal with - not mine.
Which is why I think it would be safe to ask your parents @Jen, if you like. But you can probably get some further concessions from your mom at this point, if there are things you want.