DNA Group Relationships
There is a randomness to DNA inheritance. 95-99% of the time your cM share will fall within the correct groupings. However, there are occasionally anomalies. (Example: Seeing a half 1st Cousin (1C1R) sharing as high as a full 1st Cousin - or - seeing a 3rd cousin sharing as high as 2% / 150 cMs.)
You will need to consider many relationships and use the amount shared as a guide. You will have to dig into the tree to see what relationships are possible. If you believe you are dealing with an anomaly or an outlier, the only method to know for certain is to test an additional family member to confirm.
You will need to consider many relationships and use the amount shared as a guide. You will have to dig into the tree to see what relationships are possible. If you believe you are dealing with an anomaly or an outlier, the only method to know for certain is to test an additional family member to confirm.
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Group A Relationships
Average cMs: 2650 - 3900 (37% - 54%)
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Group B Relationships
Average cMs: 1300 - 2300 (18% - 32%)
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Group C Relationships
Average cMs: 575 - 1300 (8% - 18%)
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Group D Relationships
Average cMs: 215 - 650 (3% - 9%)
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Group E Relationships
Average cMs: 75 - 360 (0.42 - 3%)
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Group F Relationships
Average cMs: 30 - 215 (0.42% - 3%)
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Group G Relationships
Average cMs: 0 - 109 (0 - 1.52%)
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Group H Relationships
Average cMs: 0 - 75 (0 - 1%)
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