Need help w brother. He might be getting depressed?

So long story short my brother (older in college) was depressed and suicidal in middle school. Never told anyone except he told me this a year ago.

Our family situation is kinda stupid. Parents shouldn’t be together but are. We are all very distant from each other except me and my mom. I try to interact w my brother and so does my mom but it’s just not natural for us cuz we haven’t really ever been close since we were in elementary school. (I’m a senior in HS).

Anyway my mom told us that her and my dad are gonna separate. This brought up lots of emotions for my brother (his reason for his depression was cuz of our family situation ).

Anyways it’s been like 3 months since my mom said this and nothing has been changed. My mom still wants a separation but feels guilty w my dads health and we can’t financially afford it.

Because my bros in college he isn’t updated too much. So he came back yesterday for the weekend and he seemed kinda off when I picked him up. I ended up going to a friends house that night. He texted me saying that he was going back cuz he forgot his laundry but I don’t think that’s the reason he left so soon.

I think he was disappointed nothing changed w the family. There’s no way he would of come up from college for only a few hours then gone back just cuz laundry. My mom noticed this too and her and I talked.

Idk what to do though. It’s hard to talk to my brother cuz we usually don’t really. Sometimes when I try he gets annoyed or mad. Other times he wants to talk and stuff so idk. Pleaaseee help.

I’ve noticed he’s taking naps when he’s home and that’s not like him at all so I’m thinking he’s starting to get sad again. What should I do? I’d like to go on a vaca where there me no snow and it’s warm and sunny but we have.no money and it’s hard cuz he has class (I do online)