Originally Posted by froggy7
I wouldn't think that would be legal. I can see saying that you would be entitled to the same inheritance as any naturally-born child of your father. But, if I were your aunt and didn't want to leave your dad any of my money, I don't think he could force me to leave it to you, which is what "I am to inherit from all adopted family members" says. It's your aunt's money to dispense as she wishes.
However, it's possible that you are paraphrasing legalese, in which case the wording may not be as sweeping.