Legal Question in Civil Litigation in Florida

As a preliminary consideration, if she left a valid last will and didn't provide for him in the will, then there really is no legal basis for him to contest the will. Regardless of the adotion status, if he is not in the will, he is not entitled to any distribution.

However, if there is a residual estate to be distributed to "heirs," then he might have a potential claim, and it would be important to know whether the adoption was legally done. I would compel him to provide the proof, although you also may ultimately have to do some investigation.

I am assuming that your aunt died *intestate* -- that is,without a will.

Of course, if there is a will, then that would resolve the question --just look at the will--, so your inquiry only makes sense if we assume she died without one.

A. If he was legally adopted, then the adoptive parents are his legal parents for all purposes. Biological parentage doesn't matter in this case.

B. I don't understand the fascination with the birth certificate. When he was born, he was your aunt's son -- you say he was adopted at age 6. Why would a birth certificate, which states the facts six years before adoption, have any meaning?

His birth certificate is prima facie evidence that he is her legal son. You would need evidence to contradict that.