Triangulation vs. “In Common With”

This question came up in one of the posts in Blaine Bettinger’s Facebook Group Genetic Genealogy Tips & Techniques, so I thought I’d give a quick example here that I refer to myself when I get confused.

A man with 3 children, who have all tested, has a match to a 2nd cousin (documented through now through both DNA and traditional genealogy).  He and the 2nd cousin share 11 segments of DNA.

It so happens that all 11 of those segments have passed down to those 3 children, which you can see in the illustration below.  Of those 11 segments shared by their father and his 2nd cousin, Child 1 inherited 4 segments.  Child 2 also inherited 4 segments — but an entirely different four segments than Child 1.  Child 3 inherited 7 of the 11 segments.

The inheritance and sharing is illustrated below, in data pulled from GedMatch.

Inheritance

For purposes of illustration, we’re setting aside the fact that generally, when triangulating to find a common ancestor, we don’t use two full-blooded siblings as 2 of the triangle legs; they are too closely related, and will triangulate on many segments.

That said, Child 1, Child 2 and their 2nd cousin once removed (2C1R) have DNA in common with each other, but no triangulated segments with their 2C1R.  This is because Child 1 shares DNA with 2C1R on chr 6, on chr 12 and 2 segments on chr 15, while Child 2 shares DNA with 2C1R

Child 1, Child 3 and their 2C1R have 3 triangulated segments: on chr 6, on chr 12, and 1 segment of chr 15.

Child 2, Child 3 and their 2C1R also have 3 triangulated segments: on chr 4, on chr 8, and on chr 18.

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And that is a quick overview of triangulation vs. in common with.

 

 

My review of the B.U. Certificate in Genealogical Education course

This past fall I took the Boston University Certificate Program in Genealogical Research.  This is a 15-week online course (for continuing ed credits only — NOT undergrad academic credit) taught by experts and professionals in the field of genealogy. 

The program was updated and modified with my class (Fall 2018).  It now has 4 modules:  (1) Genealogical Methods (5 weeks); — taught by Allison Ryall
(2) Evidence Evaluation & Documentation (4 weeks); — taught by Julie Michutka
(3) Forensic Genealogy (4 weeks);  — taught by Melinde Lutz Bryne, CG, FASG
(4) Genealogy as a Profession (2 weeks). — taught by Angela Packer McGhie, CG

Assignments were due each week, and were graded.   In addition, you are expected to log on regularly, and to participate regularly in discussions that are part of each module.  You need a grade of C or better in each module, and a B- overall to attain your certificate.  (Note: this is just a certificate.  It does NOT mean you are a Certified Genealogist through the Board for Certification of Genealogists.)

Getting on to what I thought of the course, I loved it!  It was well worth the cost (close to $2,700 — but I got 10% off, as I am a member of National Genealogical Society).  I did NOT take the 7-week Essentials course suggested by BU in advance of this course, deciding instead to just take the plunge.  I definitely needed a minimum of 20 hours per week to get through this course — but some weeks were more intense (citations!) and other weeks were “easier” (for me, that was the first module).

While I can’t make specific remarks as to the course content, my suggestion is that you are best off in the first module if you are familiar with a wide variety of records and have a high-level understanding of how DNA matches play into genealogical research.with DNA.    The module on evidence and citations has a new textbook — Thomas Jones’ Mastering Genealogical Documentation.  You are taught the art of citing your sources by understanding the source itself and the information within it — so you won’t have to just refer to templates.

The Forensic Genealogy module includes a focus on Ethics, since ethics play a significant role in dealing with living people, as far as DNA research and (financial) inheritances are concerned.  Finally, the module of Professional Genealogy covers the basics of what it takes to be a professional genealogist, using the brand-new Professional Genealogy: Preparation, Practice & Standards (published in 2018).

I found all the instructors (and their assistants) to be extremely responsive to my fellow students and myself.  I also thought the interaction between the students via discussion forums to be extremely helpful, learning as much from my classmates as from the coursework itself.  (The interaction between classmates is limited to the group you’re in, however; there were enough enrolled students for Fall 2018 that the students were divided into 2 sections, and further divided into 5 subsections of roughly 25 students each.)

All in all, if you want to ramp up your genealogical research skills very fast, this is a great course in which to do it.  Be prepared for a “grind” — you’ll likely need those 20+ hours a week to work on the readings and assignments.  There were about 4 or 5 in my own subsection of roughly 25 students that apparently dropped out before the end of the first module.  Afterwards, if you earn your certificate, you can choose to join the alumni mailing group (which includes alumni from all the past classes, back to 2009); a Facebook group exists as well.

 

Genealogy Goals for 2019

I’ve never been one for rigid goal-setting, or resolutions. (Hey, my Myers-Briggs type is INFP — and we “P” people like to keep our options open!)

That being said, I’m in a fairly unstructured time in my life right now; a little structure will keep me focused. And the cherry on top is to post my plans here.

Here’s to an awesome 2019! Happy New Year!

Education and Development Comments
BU (online class) for Certificate of
Genealogical Research
completed Dec. 2018
IGHR (Athens, GA) week of July 21, 2019;
registration opens 2 Mar 2019
Texas Institute of Genealogical
Research 2019
week of June 9, 2019
Legacy Tree webinars focus on BCG-sponsored
Community and Colleagues  
join Assn of Professional
Genealogists
done!!
renew Indiana Genealogical Society membership done!!
renew NGS membership done — 2 year renewal
join Tx State Genealogical Society done!!
start attending DGS meetings and
DNA SIG meetings
attend meetings regularly in 2019
Writing (high-level)  
Evaluate: what do I know and
how do I know it?
for key (aka “brick wall”) ancestors
Formulate a research question and a research plan for each of the
“brick wall” ancestors (above)
 
Write up GPS proof summaries (or narratives) for each research question I’ve asked (and think I’ve answered) re: my ancestors’ lives  
DNA  
Continue mapping my
chromosomes
my favorite thing!
Copple (family line) project  
Ask other cousins if they will
consider testing
 
Long-Range  
submit my lineage to Sonoma
County Genealogical Society for a
certificate (if approved)
by the end of 2019
submit an article to NGSQ this is at least a year away
get my CG designation — or my AG designation this is at least a year away
enroll in and complete ProGen
study course
typically a 6 month wait list, after
you enroll. Offered 3 x a year.