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Any rights that you would have would go through your parents. If your step father / step mother did not legally adopt you, then you would not have any "intestate" rights to your stepparent's estate or any assets of a step sibling.
Even if you had a blood or otherwise legal sibling, you would not have any rights to his/her estate if that person did not mention you in a will.
Only if there was no will and you were a legal sibling (adopted / blood) would you have a chance to recover part of that sibling's estate. But this would require that the sibling's spouse and children / great grandchildren / etc... either be deceased or not in existence, as well as the parents be deceased. Only then would siblings have any claim to the estate.
So if there never was an adoption, then even if there was no will in place, you would not have any claim to a stepbrother's estate. But a will trumps even those laws, so what the will says will take precedence over state law on the matter.
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