Daughter doesn't care about my cancer and now my son hates me

Everything in my life is just miserable. I told my daughter that her and her boyfriend need to stop doing drugs and take care of their baby or they have to leave. She basically told me I can't control her and fuck you. I told her I can't keep taking care of her daughter. I'm about to start chemo. Last time I had cancer and went through chemo I was so weak I couldn't take care of my own kids and had to send them to stay at my moms. She told me she doesn't care about my cancer and I told her than she and her boyfriend can leave. I don't want to send my granddaughter away because she's just a poor baby but I won't be able to care for her. I ended up talking to my 15 year old and telling him his sister and her boyfriend are going to be leaving. Her boyfriend constantly bullied my son for no reason. I told him I'm going to need his help to take care of their daughter because I won't be able to do it going through chemo. He brought up how he won't even be home much because he has band camp this summer and I told we may have to talk about that. That didn't go well at all. I told him I'll need his help to care for her, he's yelling saying he needs to go to band camp and it's not fair that I always let his sister mess with his life. I know it's not fair saying he can't go to band camp. I'm just so stuck on what to do. He then said he's going to go live with his dad and slammed his door.... Fuck me... So now my kid hates me. His dad ended up calling me because our son called him. I gave him a run down of the situation and he said our sons tired of me making my daughters mistakes his problem. So now he's planning on moving in with his dad. I need a drink....