Maternal relationship is confirmed by an autosomal AncestryDNA test match between Sean Tuck and RC, his 2nd cousin 2x removed. Their most-recent common ancestors are James Coasby and Sarah Abraham, the 3rd great grandparents of Sean Tuck and great grandparents of RC. Predicted relationship from AncestryDNA: 4th – 6th Cousin, based on sharing 92 cM across 6 segments. DNA test taker Sean Tuck is the great grandson of Frederick Todd, the son of Catherine Coasby, the daughter of the common ancestors James Coasby & Sarah Abraham.
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DNA Connections
It may be possible to confirm family relationships with Frederick by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: