Does the fine print regarding contingent beneficiaries of an IRA policy take precedent over a Will?

Question Details:

My grandmother's Will states that half of her assets should pass to her daughter and half to her son (my father), and to their children if either precedes her in death. My father did precede her in death and now my aunt (the other beneficiary) is the executor of the estate. My grandmother had an IRA that was do be paid equally to her children but the policy states that if either of them precede her in death the interest of his or her heirs shall terminate completely and the % share of any remaining beneficiaries shall be increased on a pro rata basis. Does the Will or policy prevail?

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