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    1. Re: [AUTOSOMAL-DNA] Question about X-DNA and sisters
    2. Greg Lovelace
    3. Tim, Ann, and Curtis, Thank you for your responses. It looks like the two sisters in question are not full sisters. Tim agrees with the assessment of Ann, and so do I. It looks like they are half-sisters with different fathers. Needless to say, this has come as a shock to the ladies involved. Waiting to see what fallout occurs. Thanks, folks. Your input is appreciated! Peace, Greg Lovelace¬† Part of the Tree Research Services 683 Edmonds Drive Charleston, SC 29412 [email protected] www.part-of-the-tree.com -----Original Message----- From: Tim Janzen [mailto:[email protected]] Sent: Wednesday, January 24, 2018 3:42 AM To: [email protected]; [email protected] Subject: RE: [AUTOSOMAL-DNA] Question about X-DNA and sisters Dear Greg, If you look at Blaine Bettinger's chart at https://thegeneticgenealogist.com/wp-content/uploads/2017/08/Relationship_Ch art_FINAL_August_2017.jpg you will see that he doesn't have any data indicating that full siblings share anything less than 2209 cMs. There could be situations where full siblings share less than that, but I agree with your conclusion that A and B are 1/2 siblings. The fact that B and C share no autosomal DNA at a 5 cM threshold means that that can't be any more closely related than 2nd cousin once removed. It would appear that A and B share the same mother, but that A and B don't share the same father. The father of A is the brother of the mother of C, but the father of B isn't closely related to either A or C. Inheritance of the X chromosome among siblings can be variable. If two sisters have fully-identical regions then they are very likely to be full sisters, but apparently A and B don't share any fully-identical regions. Sincerely, Tim Janzen

    01/24/2018 03:43:02