My Parents are going back to greece for christmas and usually we would all go with them but for various reasons it doesn't really make sence (pregnancy, exams, jobs etc) So we are doing Christmas without them at mine and DHs house.
So there will be - me and DH, dBro1 and partner, dBro2 and DSis.
DBro2 girlfriend is going to come for boxing day but isn't staying (she isn't from too far away).
We live in a small terraced house - so sleeping wise will be a bit of a squeeze.
Anyway DSis will be 17 by the time Christmas rolls by. Her boyfriend (who is 19 - they have been together for about 2/3 yrs but knew each other before that) is in the RAF (and has some time off around christmas :) ) and will be spending Christmas eve and first part of Christmas day with his family (they do their main bit of Christmas eve night).
Anyway DSis BF is staying at ours Christmas day night (boxing day is a big deal for us)
DMum asked about sleeping arrangments over the 3 days and I told her. She hit the roft.
DSis and her BF are having sex, DSis checked with me that her and BF would be sharing a bed (of course).
My parents rule was/is always that you can't share a bed with a girl/boyfriend until you live together - that is always been their rule. Fine
DMum says that DSis is still under 18 and still has to abide by parents rules, especialy if she is still within the 'family' group (if that makes sence).
As far as I'm concerned my house, my rules.
DMum thinks we should continue their rule while they are away, I think that is ridiculous.
AIBU or is she ?