DNA Do-Over – Month 5 – May 2018

The DNA Do-Over - Month 5 May 2018: DNA and Relationships: What Can You Believe?

DNA and Relationships: What Can You Believe?

Click HERE for a complete list of DNA Do-Over topics for 2018

DNA and Relationships: What Can You Believe?

During May 2018, we will cover the following areas of this topic:

  • Understand the different types of cousins and other relatives
  • Are the relationship categories accurate?
  • Testing multiple siblings
  • Which DNA test can help sort out two possible mothers, fathers, grandmothers etc.

DNA Do-Over Month 5 Resources

This is a developing list and as we discuss this month’s topics we will add to this document and finalize it on May 31st.

DNA Boot Camp

Getting Started with DNA and Genealogy Digital Download

Getting Started with DNA and Genealogy Digital Download presented by Mary Eberle, JD. Two 90-minute webinars plus syllabus materials covering:

  • Introduction to Using DNA for Genealogy Research: Want to start using DNA for genealogy research but want guidance on the best approach? Received your DNA results and want a better understanding of them? This talk covers DNA basics, available tests, where to test, and how to develop your DNA testing plan.
  • Using Autosomal DNA for Genealogy Research: Autosomal DNA (atDNA) provides the most useful information for most genealogists. Learn how to analyze your atDNA test results and how to find common ancestors with your DNA matches.

Click HERE for more information

Additional DNA Tools and Concepts Digital Download

Additional DNA Tools and Concepts Digital Download presented by Mary Eberle, JD. Two 90-minute webinars plus syllabus materials covering:

  • GEDMatch – Powerful Tools for Analyzing DNA Results and Finding New DNA Matches: GEDMatch is a free, third-party website offering additional tools to interpret your DNA results. Tools include a chromosome browser. GEDMatch accepts DNA test results from Ancestry, FTDNA, and 23andMe. It can be a great way to find new matches. Learn how to use this helpful website.
  • Using Y-DNA, Mitochondrial DNA, and X-DNA for Genealogy Research: Understanding when these types of DNA can help (and when they won’t) is crucial. Learn how these types of DNA can be used to answer your genealogy questions.

Click HERE for more information – via DNA Bargains

Web-Based Resources

  • Cousins at ISOGG Wiki: This AMAZING RESOURCE maintained by the International Society of Genetic Genealogy contains a comprehensive explanation of the cousin relationship. https://isogg.org/wiki/CousinIn addition, did you know that starting at the 3rd cousin level, cousins don’t always match when DNA testing is done? https://isogg.org/wiki/Cousin_statistics lists cousin statistics from 23andMe, AncestryDNA and Family Tree DNA.


Average Percent DNA Shared Between Relatives: a recent article at 23andMe presents a table summarizing the average percent DNA shared for different types of relationships according to results in their database.

  • Distribution of shared DNA for given relationships: another great article from the ISOGG Wiki. Included is a table showing the average amount of DNA shared by pairs of relatives in percentages and centimorgans. https://isogg.org/wiki/Autosomal_DNA_statistics#Table
  • How Much Shared DNA for Cousins Multiple Ways?: An article by Diahan Southard for Family Tree Magazine offering tips on how to determine the amount of shared DNA cross multiple relatives. https://dnabargains.com/ftm-shared-DNA-article

DNA Do-Over Facebook Group and More

An interactive collaborative community for the DNA Do-Over has been created on Facebook: https://www.facebook.com/groups/dnadoover/. Those hoping to participate in the DNA Do-Over are encouraged to join. Just like the entire DNA Do-Over program, there is no fee or “upcharge” for this collaborative environment.


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©2018, copyright Thomas MacEntee. All rights reserved.

About the Author

Thomas MacEntee
Genealogy educator and author Thomas MacEntee has been researching his family history for more than 40 years and is the creator of Abundant Genealogy, Genealogy Bargains, DNA Bargains, The Genealogy Do-Over and numerous other web-based genealogy and family history properties.