GENEALOGY-DNA-L ArchivesArchiver > GENEALOGY-DNA > 2010-11 > 1289058932
From: "Diana Gale Matthiesen" <>
Subject: Re: [DNA] DNA questions for a beginner
Date: Sat, 6 Nov 2010 11:55:32 -0400
One cautionary. Just because the descendants of the two alleged brothers have a
close, even perfect, Y-DNA match, doesn't prove the two were, in fact, brothers.
The match certainly *supports* the hypothesis that they were brothers, but the
DNA match, alone, cannot prove they were.
> -----Original Message-----
> From: [mailto:genealogy-dna-
> ] On Behalf Of Bob McLaren
> Sent: Saturday, November 06, 2010 9:58 AM
> Subject: Re: [DNA] DNA questions for a beginner
> I'm not sure if you got an answer, so I will jump in. Your questions:
> 1a. Yes, if you and your second cousin are straight line male descendants of
> brothers, a DNA test on you and your second cousin will show if the same man
> the father of the two brothers.
> 1b. It doesn't really matter which generation tests, even if they are of two
> generations. In cases where I have the opportunity to select the generation,
> to choose the oldest. This is to reduce the very small probability that a
> happened between father and son. So, in your case, I would test you and the
> your second cousin if your second cousin did not want to test. If he does,
> would test your second cousin over his son.
> 1c. You want to do a Y-DNA test. The Y-chromosome is passed from father to
> his son, to his son, etc. without any changes (except for those due to a very
> mutation rate). I recommend the 67-marker test at Family Tree DNA as the most
> 2. If a surname appears as a middle name, and if it reflects parentage, then
it is most
> likely a maternal surname. Your Y-DNA tests reflect your paternal heritage,
> maternal. While you could check Y-DNA results for that surname, they would
> match your results. At this time, you need to use convention genealogy to
> if that surname is on one of your maternal lines.
> Yours aye,
> Bob McLaren
> Genealogist, Clan MacLaren Society (based in Scotland) Chairman, Genealogy
> Committee, Clan MacLaren Society of North America Administrator, Clan MacLaren
> Surname DNA Project (Worldwide) Administrator, Lindo, da Silva, and Braham
> Surname DNA Projects (all Worldwide) Member, Association of Professional
> Genealogists Member, Genealogical Speakers Guild
> -----Original Message-----
> >From: Vern Prescott <>
> >Sent: Nov 1, 2010 11:57 PM
> >Subject: [DNA] DNA questions for a beginner
> >Hello List members
> >I have joined the list to seek guidance from people with experience
> >with DNA testing. I hope I am able to put my questions in a way that
> >people will understand.
> >Let me briefly describe my situation. My great grandmother was never
> >married but had 6 children. She had two sons, one being my
> >grandfather. I have just managed to determine who my grandfather's
> >brother was, and am in touch with some of his descendants. Now for my
> >1. I would like to try DNA on myself and on a second cousin, if I get
> >agreement, thinking that I would be able to determine if my grandfather
> >and his brother had the same father or different fathers.
> > a) Am I correct in thinking that DNA would do this for me? ( both
> >I and the other person would be male line descendants)
> > b) If I can not get agreement form a second cousin, would it be
> >advisable to use my son and his third cousin rather than myself and a
> >second cousin, once removed? I would think that keeping the same
> >generation would make for an easier comparison.
> > c) what type of DNA testing would be required to do this?
> >2. My grandfather also had sisters, one of whom had a "surname" as a
> >middle name, possibly suggesting parentage. If I discover that my
> >grandfather and his brother had the same father, am I correct in
> >thinking that I could then check against data from people of the
> >"other" surname to see if there was a match, and possibly find my great
> (or his brother) by doing so?
> >Given a start, I could use other, more conventional techniques, to try
> >to determine the correct lineage.
> >My reasoning is that if two sons had the same father, possibly all the
> >children had the same father. I assume this is a long shot, but better
> >than any other methods available.
> >Vern in Ontario
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