Autosomal DNA: Triangulation. S. Massey (Rebecca great-granddaughter) shares segments with a descendant of Rebecca's brother (James Sanders Alderman) at 23andMe that are also shared with a descendant of Rebecca's paternal aunt (chromosome 3, position 115-179). Also on this segment are two FTDNA matches (one on GEDmatch: M183552) who also have different descents from Rebecca's Alderman (and related) relations. See also chromosome 4 (position 32-63) where S. Massey matches two people at 23andMe who have different descents from Rebecca's relatives on the Alderman line.
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It may be possible to confirm family relationships with Rebecca by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Rebecca: