Why do you have to tell your father and brother to go f themselves? I would work through that before I brought that toxicity to my mom's death bed. If there is something you need to clear up with your father then do it. If he and your brother have wronged you then ask to see her at a time when they won't be there. If you have wronged them own it, get humble, show compassion, show that you are sober. If you are drinking, I don't recommend going.