Here is a real life example: A and B are actually 1/2 3rd cousins 1R, and are 66/67 for their YDNA results, and have a very strong paper trail. For their Family Finder results: FTDNA guesstimated them to be 3rd cousins 2nd Cousin - 4th Cousin (range) 3rd Cousin (suggested) 69.86 (shared) 45.83 (longest) melissa springer robards