((((UOME))) so glad u did get that out....it sounds like you are feeling overwhelmed and i understand why!!! lots of major decisions to make and also first on the list, take care of you. without you taking care of u first, the other good intentions u may have may not be able to happen. so please try to be kind to yourself as you would a good friend who is going thru such a difficult time as u right now. i don't know u like many others but do u have a t? with so much going on you might be able to use a t as a soundling board, plus get some good coping skiills with all those family members around u.
the decisions you are facing are important as you well know. jme, but i'd take my time to make the best ones for you and for your neph. he's lucky to have such a caring aunt.

but to do that u need to be in a good spot and tkaing care of your "self."
your sister is a grown woman and her choices may differ from ones to improve her life. idk, but you can't change her, but your neph will need the monetary support she now receives for him more, imho. i understnad how hard it is to worry about a sibling too but a gentle reminder she is making her choices. your neph is too young to make a choice and needs financial sercurity as well as constancy n his life. sounds like you are willing to undertake that if u can.
unfotunately your mom is truly sick with an addiction. not letting her off the hook on that cause she too can make choices to improve her life. right now her behavior is a direct result of her addiction. sometimes distancing ourselves from loved ones out of control are the best ways to deal with their "insanity".
just wanted to reposnd to your post. i have no quick solutions but i don't feel u were expecting that anyway. feel free to rant all you need to...i will listen and i know others will too.
please keep us Posted on how things are going, k? we care about you.