I don't think you would call it a "double legacy" if you were a legacy to both, though. Double legacy means you are a legacy to one fraternity through two members, ie. you mother and sister, or two sisters, etc. I don't think you or any of your family members are AST legacies. The NPC unanimous agreements predate your grandmother and would not allow her to pledge Pi Phi after being initiated into AST. Also, if she was a Pi Phi when the local merged with AST, she would not have been eligible to join.
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AOII
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