I'm sorry this will be a tough week for you. I wish you could find out what information you need, aside from the rest of the family, and see what plans YOU can make for you. Family has it's dynamics, you know? Unless they are in therapy to improve themselves, odds are they aren't ever going to change. What can change, since you are the observant one, is you and how you choose to allow them to affect you (or not.)
It isn't "fair." It's tough when it's family, imo, because we think they "should" love us and respect us...we're family!
You don't need to go into a hole. I hope you can release the anger, and go on with the true mourning... take care ((((hugs))))