What to do about probate and the life insurance regarding my recently deceased father's estate?

Question Details: My father recently died, he was a doctor for the VA hospital. He had no Will and had been re-married for the past 8 years. Since he had no Will, intestacy law is going into affect. My stepmom has been appointed as the personal representative of the estate, and claims that me and my two brothers (my dad's only children) aren't entitled to any of the estate. She also says that regarding life insurance, she's the only beneficiary because a paper she found said so. She filed a claim yesterday, and basically says we get nothing. Suspicious? What should we do?

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