I went through something similar when my uncle killed himself a number of years ago. A lot of my family was mad at him for the choice he made and that's normal. You'll get past the anger. I'm not going to sugarcoat it and say everything is going to be okay because it's going to be a long, tough road to deal with all the emotions you and your family will be dealing with. My advice is to try to forget about your former aunt and let that hate go, it does no good and can only prolong your pain.  Be there for your cousins, grandparents and other family members. The best thing we did was spend time together and talk about him, told stories, laughed at his jokes, celebrated his life and cried for our loss. All of us together. Trying to deal with it alone would have been soul crushing. Also, watch out for the anniversaries. Check in with your grandparents and cousins when the anniversary of his death comes around because those seem to be the hardest times and they may need some extra help then. His birthday and Christmas also.