PLS HELP??? I need serious advice

Em

Guys my bf has been struggling with depression for going on 7 years now. I’ve only come into his life this year and there’s already been a lot of damage that I’m trying really really hard to stop. Even though it’s only slowed down a bit over the course of the past six months. His parents are playing favourites between him and his older brother too. What I’m asking is, are there any tips someone is willing to give me so I’m able to help him. I’m 17 and he’s 16 so we can’t move out for a few more years yet.

Please help me, and in effect, him? I’d really appreciate it