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Determining Shared cMs for Known Relationships
I am trying to collect a large dataset of shared cMs for KNOWN relationships, in order to quantify ranges for future analysis. Aggregated results (not emails) will be made publicly available in order to benefit all genealogists.
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Known Relationship
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What is the relationship of the two individuals? (Ex. Brother/Sister, Aunt/Nephew, Maternal Grandfather, etc.). This CAN be greater than third cousins IF you have confirmed the relationship!
Your answer
Total Shared cM
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How many total cM do they share in common? (If using GEDmatch, please use the default of 7 cM) (If using AncestryDNA, please provide the amount shown on the main match page, which is the weighted amount)
Your answer
Longest Block
What is the longest block (in cM) of DNA they share in common?
Your answer
Number of Shared Segments
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Please provide the number of segments shared by these two individuals (if # of segments unknown, enter N/A)
Your answer
Endogamy or Known Cousin Marriages?
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Is there any endogamy or known cousin marriages that could impact the amount of shared DNA for this particular relationship?
YES
NO
Source
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Where did this information come from?
AncestryDNA
Family Tree DNA
23andMe
GEDmatch
MyHeritage
Other:
Notes
Feel free to note if there anything special about this relationship.
Your answer
What is your email address?
Please provide your email so I can contact you with any questions.
Your answer
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