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The rule of Y-DNA triangulation is that you have to have matching Y-DNA from direct paternal line descendants of two sons to confirm the father. It has been reported that Robert "King" Carter had four sons who produced grandsons:
- John Carter (married Elizabeth Hill) - Robert Carter (married Priscilla Churchill) - Charles Carter (married Mary Walker, Anne Byrd) - Landon Carter (married Elizabeth Wormeley, Elizabeth Beale)
Matching Y-DNA from direct paternal line descendants of any two of these four sons will give the Y-DNA of Robert "King" Carter.