Hey
Firstly well done for posting, that couldn’t have been easy.
You have an awful lot of stuff going on there.
The first thing is what about you? It sounds like you need to do what you can for you first in order to get through this horrible time and support your mum, as well as grieve for your dad. It wont be easy but somehow you are going to need to keep your brother at arms length for the time being as his issues, and they are his not yours, are making a difficult time even harder.
Unfortunately given he is 50k in debt it suggests he us a cocaine addict. This is likely why he is behaving the way he is – until he admits he has an issue, puts it down and starts to sort it out, there isn’t a great deal you can do.
Do you have sufficient support right now, dealing with losing a parent must be awful