Robin,
Two generations before the William Carpenter immigrants would make them a minimum 2nd
cousins and their children would be kissing cousins or eligible to marry each other. The
could be related farther back in time based on probabilities. The likely estimate is about
7 generations before the immigrants (born rounding off to 1600). Assuming a 20/25 year
generation this 7 generations prior could be roughly about 1420 to 1465ish.
I hope this helps explain what the Y-DNA is showing us.
John R. Carpenter
Carpenter Cousins Project
http://carpentercousins.com
From the Carpenter Cousins Y-DNA Project Notes and discussion for
Groups 2 & 3.
The continuing match between Groups 2 and 3 emphasizes that they
are closely related, while the one new mismatch turns out to be an additional means of
distinguishing between the groups. The new inter-group mismatch on marker Y-GATA-C4 (more
properly known as DYS635) has now been amply confirmed by many further results either
found at Sorenson or ordered as "a la carte" tests at FTDNA.
Based on this now-confirmed discrepancy, along with the originally discovered difference
at DYS464d, and the additional difference at DYS413a, we can state with 95% confidence
that the most recent common ancestor of the two groups was more than 2 generations before
the immigrants and less than about 20. Therefore, the DNA testing has very nearly ruled
out the often-repeated claim that the Williams were first cousins. The most likely
estimate is about 7 generations, but that is a very rough estimate, and the 95% confidence
interval is a more reasonable description of what the DNA is telling us.
From: Robin C
Sent: Thursday, May 28, 2015 12:30 PM
To: John R Carpenter ; carpenter(a)rootsweb.com
Subject: Re: [CARPENTER] Descendants of William2 Carpenter of Rehoboth
John:
What does "...far more than first cousins...." mean?
Robin
At 12:05 PM 5/28/2015, you wrote:
A brief reminder ... Groups 2 & 3 are 24/25 marker matches in the Y-DNA
testing. They are far more than first cousins as further Y-DNA testing has
indicated. See the notes & comments for Group 2 & 3 on the Carpenter Cousins
Y-DNA Project page.
http://carpentercousins.com/carpdna.htm#toc006 or see
B) below for the basics.