Will your Mom be going with him? If your Aunt is not expected to make it, and you might have to leave a facility because of it, then, and only then, should you consider delaying.
If you can get yourself to detox and rehab, go...GO!
You seem to want sobriety so much but you are struggling against is so hard that I honestly believe that a professional setting is crucial for you. I think that sobriety is waiting for you, but you must surrender completely to it. You owe it to yourself to get help.