Long story short, they have both recently lost their jobs, so rather than borrow money for rent etc they are moving in with DD boyfriends parents. I see her most evenings at the mo, so will probably see her once or twice a week, I think I'll make the effort to go over during the week & at weekends. I do feel so sad, I'm also proud of them both for deciding not to borrow money & get into debt but to move out. They won't have any additional bills to pay as they were in MiL's old house so it was a private rent. We could let them live there rent free but they'd still have electricity etc to pay & they don't have any savings to use until they are both back in work.
Just realised, I didn't really make it short!