[my_pointy_head_is_sharp]

So I am going to suggest they start sleeping together there.

No, you don't want to do that. Otherwise, you'll be condoning it. Just tell your son (not her) that the arrangement isn't working. Let him find his own arrangement, without your condoning anything.

[Retired Greyhound]

I don’t condone it. They know that. But I won’t tell them they can’t do it there. They can do whatever they want.

But I see your point.