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I believe I have finally found my biological father. I was recently contacted by a possible cousin.

Amount of Shared DNA in Ancestry is 548 centimorgans shared across 31 DNA segments.

In GEDMATCH the Largest segment = 75.3 cM Total of segments > 7 cM = 625.0 cM 25 matching segments

Estimated number of generations to MRCA = 2.3

Is this a good chance that I have found my long lost family?

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Questions like yours are now easily answered using a tool linked to at How can I determine the likely relationship based upon autosomal DNA shared cM?

That DNA Painter tool shows that for 625 cM a first cousin relationship is possible, and at 548 cM you are close too.

Click the preceding links to see nice pictures illustrating your possible relationships.

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