so if your daughter goes off to university thats tough. She can't use it (legally...)
I don't think that's the case. If their principal residence is still "home" - i.e. where the licence is located - then that's not a problem.
Of course, should they finally flee the nest and leave home and take up permanent residence elsewhere, then that's a different matter.
It's probably academic (pun intended) now that MS have discontinued that product - the only multi-licence home product is 365
SD