What does Islam say about having a non-Mahram live in your house while you have 3 adult daughters who find it kind of difficult to cover themselves for most of the day?
If your adult daughters find it difficult to wear full Hijab at home in front of the Non Mahram man, you must protect them from falling in sin of being seem by him with out full Hijab. You must arrange for him another place to live, away from your adult daughters.
Wassalam.