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Old 7th December 2017, 05:56 PM
TwiddlingThumbs TwiddlingThumbs is offline
FTDNA Customer
 
Join Date: Jan 2016
Posts: 113
A few thoughts:

1. I'm not sure it is impossible for you to be half first cousins with the other gentlemen. "On average," half first cousins (eg, same grandfather, different grandmother) share 6.25% of their autosomal DNA, but I think it might be possible from them to share none. The close Y-DNA match and proximity are intriguing.

2. I think TiP percentages may very well overstate the probabilities. FTDNA does not disclose how TiP is calculated, so it may not consider the possibility of back mutations, which would change the probabilities significantly.

3. STR testing is all just probabilities. Y-DNA SNP testing is much more definitive.
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