Solving a Brick Wall with DNA – A Case Study

Solving a Brick Wall with DNA – A Case Study

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by Larry W. Thomas

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Solving a Brick Wall with DNA – A Case Study


How I used both Mitochondrial and Autosomal DNA to prove a great grandmother’s maternal line. When no paper trail gives answers, sometimes we can turn to DNA to provide the proof of the relationship and then introduce new documentary evidence to draw a valid conclusion. In this case, my father’s maternal grandmother’s parents were a complete mystery but I was able to conclude who her mother and grandparents were using DNA and documented evidence. Since her mother was not married and no evidence at this time, her father remains a mystery. For now.


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Presenter: Larry W. Thomas

Larry is a retired US Army Captain with 23 years in the field of Aviation, Transportation & Logistics. He has a Bachelor’s Degree in Aviation Maintenance Management, an FAA airplane mechanic license, and earned an MBA in Management Information Systems from Southern Polytechnic State University while working for the US Army Reserves as a Project Manager, earning his Certification as a Project Management Professional from the Project Management Institute in 2013. Larry began his Genealogy Research 30 years ago with his own Thomas Family— Georgia residents since the 1750s. He then added the rest of his and his late wife’s families before beginning to research for clients in 2008, operating A graduate of ProGen 38 and member of the National Genealogical Society, Association of Professional Genealogists, Genealogy Speakers Guild, Gwinnett Historical Society, Larry serves on the Board of the Georgia Genealogical Society, and is past president of the Cobb County Genealogy Society.

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