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I have a match of only 16cMs with someone whose tree overlaps mine so we share my 4 x great grandparents and his 6 x great grandparents. My sister shares this match too so how likely is it to be a genuine match or is it possible it is just a dna glitch. The reason I ask is that I am now not sure that this line of my family is correct. I would love it to be but a recent discovery makes me doubt it.