Why does my sister always let my man and I stay at her place rent-free whenever he's around? 🥺😭

I shouldn't question it, but It's so generous. It's too generous! Like, how are Desmond and I ever going to repay her for allotting us a place for us to stay at her nice-ass house in one of her guest bedrooms (which is practically a mini hotel room with its own bathroom) damn near every weekend for the price of nothing?! I tell her we can just get a hotel or something and she gets annoyed and snaps at me "Just stay at my place!" Is it wrong to question why she's so okay with this?