That really sucks dude, I can sort of relate because I have lost a close cousin, my grandma, and my dad is getting married the chick that caused my parents to split up. All this in 3 months, so I know what its like.

Just actively do whatever you can to stop the evil aunt from jacking your shit. While mourning is obviously something you need to do, and spending time with your mom is a must, don't stop trying to do what you can to better your situation.

Sorry dude, all that sucks.