Does a wife have rights to a life insurance policy if she was not named as the beneficiary?

Question Details:

My father recently passed and had myself and my brother as the only beneficiaries on his policy. He took the policy out 20 years ago, after our mother died. He re-married 10 years ago. Our step-mom is threatening to sue us, believing she has the right to a portion of the life insurance payout since they were married. Does she have any standing here?

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