I notice that LW is extremely unwilling to spell out why they want Daughter and DIL (?) to share a bed - is it because they're unmarried, or is it the gay thing, or both? - but at any rate, LW needs to decide whether a relationship with Daughter is worth keeping, because if they keep this up, Daughter's gonna decide it isn't.

I stayed with them once, and they slept in the same bed.

Yes? How many beds do you expect them to have, LW? Or was DIL supposed to sleep on the couch?