Estate Law Questions? Ask an Estate Lawyer.
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did he formally adopt you?
You do stand to inherit as next of kin based on the relationship over his siblings.
Clearly this would be easier if he adopted you so you need an estate lawyer to negotiate with them and assert your right as his child for all purposes. If an agreement cannot be reached the lawyer would petition the court to make such a finding.
You can do it yourself or have an estate lawyer handle it for you.
I do not recommend handling without a lawyer
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