Their house, their rules. I would just be quiet about it. They won't be around much longer...
My & my man have been together 14 years, have 3 kids & own our home. We're going to visit his 70 yr old parents who won't allow us to sleep in same room. I'm upset. Do I keep quiet for the sake of my man? Haven't seen them in 7 yrs.
Yeah just deal with it. They obviously don't like unwed people in the same bed, to each his own, like Diva said, their house their rules.