In the main line I am studying we have several participants whose MRCA is about 200 years ago and the number of mutations at the 67 marker level ranges between 0 and 3, with 0 being most being the most common.
I see you are the administrator of the Abernethy/Abernathy DNA Project.
One of my 3G grandmother's was Tennessee Abernathy, she married Robert T. Hoskins. According to the 1880 District 13, Davidson Co., TN Census she was born in about 1818 in TN and both of her parents were from VA.
Would you happen to know who Tennessee Abernathy's parents might be?