Can your family say no after you are dead?
Dunno. Don't care. I'll be kinda dead. They can make Christmas decorations out of a bucket of my gonads for all I care.
So you... don't care how your family feels about it. Alright.
I doubt anyone will want his organs. They want young peoples organs for transplants. Old peoples are worn out and won't last as long, and I doubt gentlemand is a spotty school kid.