I am not sure how yDNA testing would imply a common ancestor within a couple of generations. In our family DNA project we have one 4th cousin and three sixth cousins from four different sons of our common ancestor that was born in 1720. These four men are perfect matches at 67 out of 67 markers. There are many others who descend from one of these four sons or two of their brothers and have one to three mutations in the 67 marker test. We have also had three who tested that turn out to be in the NPE category but we have been able to determine when each of these three occurred. Two of the three were from families with an unmarried daughter (18 and 21 years old) and the grandparents raised the child as their own. These events were in the 1850s and 1860s. Les On 5/19/2012 3:00 AM, roots-request@rootsweb.com wrote: > On another line, The Rev Robert Bruce was born in Scone, Perthshire, > Scotland in 1778, attended U of Edinburgh, emigrated to the US ca 1801. He > became chancellor of the "Western University of Pennsylvania", now the > University of Pittsburgh. His history is well documented in church records. > > In the yDNA groups, these two are quite close, implying a common ancestor > within a couple of generations.