Jazz- what a sucky story. Addictive drinking sucks. It damages- across time, oceans..hearts. I guess you already know what is what. No one has any control over what you dad does. Your choices- even if you lived next door to him...are really limited. Talk to him...you cannot rescue him. I would think you are worried, concerned and also feeling lots of conflicting thoughts. There are just way 2 many dynamics in every different family for sage advice. I do know you need to validate your own feelings and try to accept and deal with them. Talking to someone/others? Al-anon may be of help , or a professional. Such feelings may very well open up a long shelved set of feelings from the past.
Support, empathy and prayers to you, your dad and your bro.