Using DNA and Gworks for Solving Unknown Parentage Cases
KITTY MUNSON COOPER
blog.kittycooper.com
All my slides are at https://slides.com/kittycooper
23 pairs of chromosomes
Image of painted (SKY) chromosomes - Courtesy of DeWitt Stetten, Jr., Museum of Medical Research
How can DNA matching identify a relationship?
Chart from ISOGG wiki (courtesy Dimario, Wikimedia Commons)
How can your DNA identify a relative?
The amount of shared DNA is a range
measured in centiMorgams (cMs)
display from the calculator at https://dnapainter.com/tools/sharedcmv4
Step 1: TEST your DNA:
at Ancestry and 23andme then transfer to the othersUpload the Ancestry DNA results to other sites for free to get more matches:
- MyHeritage
- Family Tree DNA *
- GEDmatch
- DNA.land
- LivingDNA (no matches until August 2018)
*$19 for the full tools
Once your matches come in ... (start at Ancestry)
Look through the family trees of 2nd, 3rd, and 4th cousin DNA matches for a common ancestral couple or two.
Build private, unsearchable family trees down from each common couple to find where they intersect and/or someone in the right place at the right time.
This may only get to the great grandparents
Then build the pedigree tree of a candidate parent back to at least 1800
Make sure this tree is private and unsearchable
Add a fake child to that parent and then connect your DNA to it
Ancestry will use auto complete in the name field
Select the pedigree tree you created and link to the fake child
Now wait for the hints and see if they are consistent with your hypothesis
Check the cMs of each match and compare them to the charts
Do they fit your theory?
Are there tools to make this process less labor intensive?
Is there automation for comparing trees to find common ancestral couples?
Collects and compares the trees of your matches into your own private database at DNAgedcom.com
In order to use the tree gatherer you need to be a paid member
Find the app called DNAgedcom Client on your computer or look for this icon
Clicking the icon brings up this menu in a box
DGC needs your silver member account DNAgedcom username and password
You also have to tell it what folder to store the results in
Every person you are working on needs their own account at DNAgedcom but you can use your one paid account to collect the data
Use the GWorks Client (DGC) to gather your Ancestry match data
Enter your ancestry username and password
Select Quicker and Skip Distant Cousins
Once you are logged in, the name(s) of people who have shared DNA with you show up in the profile box, select the desired one in the dropdown
Click Gather Matches, when it finishes click Gather Trees, when done DO NOT click Gather ICW
Now your database is ready!
Clicking on the tree name under the ancestor in Compare All Trees takes you to the DNA match
Having the same ancestor in 3 or 4 trees may not be significant if the trees are all from the same user
If you have a second cousin match with a tree, you could try the mirror tree approach
or a video https://www.youtube.com/watch?v=XyR_aBl89mId
Better ... See if GWorks can identify which line from the second cousin match is the one
Top ten ancestors in GWorks
From a recent case, here is the tree of a 2nd cousin match - can you find any GWorks listed names in the far right of the pedigree?
The Pratt Cranford marriage has 8 children
Three of them have DNA tested descendants, check the McGuire for clues
3 children
D
Surname frequency can help you decide which children's trees to build down in an unknown parentage case
So the next step was to look for the surname of Pratt B's wife and then for child D's spouse
Targeted Testing
Child D's spouse's surname is in the database many times, now to get a child of D, a possible parent to test
These are the names of the original Spanish settlers of New Mexico
These numbers for the tree matches scream out ENDOGAMY
Top ancestors for an unknown father case ...
The advice to people with endogamous roots is to wait for close matches, 2nd cousins or better ... Tina had one at each site
23andme match
MyHeritage
Ancestry match
9 Sons
We had to build the trees for the Martinez matches
Obituaries are a great source for finding the names and parents of the living
Both of the 2 sons who were in the right place at the right time to conceive Tina are dead, but one of each of their children has tested and now we wait
Meanwhile Julie, a daughter of one of the possible half brothers, tested independantly at 23andme and shares 774cM (about 10%)
As of yesterday, both brothers tests are in!
You can use a half sibling or first cousin match to isolate one side by starring those matches
The m_ file is a useful spreadsheet for tracking your research
You can upload GEDcoms from other sources and add them to your database at DNAgedcom
Some adoption searches end happily - new dad Billy has sold his house and is moving near to daughter Cheryl and his sister in Florida
To learn more take a class at DNAadoption.com
GWorks for UnknownParentage searches
By Kitty Cooper
GWorks for UnknownParentage searches
Slides for my 2018 Jamboree talk on GWorks for adoption searches
