Boyfriends brother

Rant!

me and my boyfriend live together. About to have a baby hopefully in the next day or two. I’m currently on maternity leave. His brother is currently homeless and needs lots of help. He is always trying to fight and do things his way. He works here and there. He comes over at whatever time that he wants and whenever he wants. He’s getting very comfortable like if the small one bedroom one bath is big enough for 3 people plus a soon newborn. He’s always looking through our fridge and eating everything and dirtying dishes and just leaves them there. He reminds me a lot of my dad. Not saying he’s a bad person but he’s very negative and too macho. I “don’t” mind him being over at times but everything else is too much. It’s not like I get paid enough to buy groceries for three people that would last atleast 3 weeks (includes lunch for work) and us to be comfortable and I don’t mind picking up after my boyfriend but his brother?! I don’t want to be his mom. Also what I dislike is that my boyfriend doesn’t really want him at the apartment because it’s always negative talk and politics and racism and guns and he just keeps rambling about those things but he wants to help him either way because he was once homeless too but when he leaves he’s always complaining about his brother and what he said and stuff. My boyfriend also stopped asking me if it’s ok for his brother to come and be with us, he just assumes that everything they both do is ok after we spoke about it a lot. I told him last night that once baby is here, that I don’t want his brother to show up whenever he wants and not so frequently either. He agreed but we’ll see how things turn out. Idk what else to do. I don’t want my boyfriend to be upset with me or think that I don’t want to help his brother and idk if it’s the pregnancy hormones but I just don’t want to do this