need to vent

My partner, 5mo baby, and I live with my parents and brother. We’re looking for a home bc we want our own space. My brother is 35 and has been living lavishly with my parents for his entire life and bashing his children’s mother for absolutely no reason. Anyway, my brother smokes marijuana. I don’t care that he does. My problem is that he sometimes does it in the house. My partner and I have told my parents we’re not comfortable exposing our daughter to it. As long as he does it outside away from the baby we’re fine with it. Seems reasonable at least to me. Tonight I go to the bathroom which is next to his bedroom and can smell his marijuana from the hallway. Didn’t want to just flat out say that he’s smoking in the house to my parents so I try to hint at it by asking if he was inside because it smelled like marijuana. To which my mom responded (with attitude) “No he’s outside then” My parents have had an issue with him smoking for as long as I can remember but at one point realized that he’s grown and is gonna do whatever he wants so they at least agreed with him that he does it outside. Clearly he doesn’t care about that compromise anymore. It’s frustrating because A. he’s making good money but isn’t looking for a place of his own and continually talks shit to my parents about his children’s mother when he’s never around when he has them. B. I can tell my parents are just tired of having to deal with his drama. It saddens me because they’ve dealt with it for YEARS and I know that they just want to get away from it all and have this space to themselves which is why my partner and I are eager to get out of their hair but my brother doesn’t seem like he has any intention of leaving their side. I know that I shouldn’t make his drama my business and maybe I’m wrong for feeling the way I do but I can’t help it. I’m just hoping that we find something soon so we can distance ourselves from his negative energy and I can feel peaceful in my own home.