What will i do with my family?

My parents aren't separated but me and my sister are living with my Mom while my brother lives with my pop. My Pop doesn't have a job, a drunkard, and a gambler (a loser). We send them money on a weekly basis as both of them are unemployed. But recently, my Pop had been sending us news that they want to move in. It's okay with me. At least we could stay under one roof after 8 years. But my problem is, I think my mother is in love with another guy! She didn't like the idea and would just give me a cold shoulder every time I try to discuss with her our situation. My sister also hates to have my father around. But I am worried with my brother and his future. Apparently, he is following my father's path and I want him here with us so I could help him change. I'm getting sick of these people but they're my family. And I really don't know what to do right now.