It sounds like must you have legal rights under that will. You do not seem to be under any duty to relinquish your rights. Do what is best for you. You should not sign any legal documents unless a lawyer acting on your behalf reviews them first.
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You should not really be making any decisions until you know what the will says and you can get a good estimate on the amount and type of your inheritance. Plus, the Aunt, who is very interested in your decision, is telling you what the grandmother's intentions were, but who is to say? The grandmother may have wanted you to to take your father's portion and thus she purposefully never changed the will. Legally, the will is taken to be her intentions at the time of her death. Plus, even if the will was not valid, then you would probably still get an inheritance through intestacy. So, you should go see a probate attorney to assist you through this process so yo can make an informed decision.
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