You’re saying he is extremely wealthy but is he really? I get the sense from your post and comments that he’s not exactly all that wealthy. And it’s nice that he says you’re inheriting it, but unless there’s some sort of iron clad signed agreement, I’d take that statement from him lightly. You’re entitled to the full 25%. Don’t get intimidated or rushed into something that you’ll potentially regret later. Be civil. Contact an estate attorney to really look things over and be patient. Try to get as much contact with your uncle in writing as possible (emails, texts)