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ahnentafal

Glossary of Genealogy Terms

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ahnentafal
A numbering system used to identify each individual in a family tree. The formula states that an individual's father is twice that individual's number, and that an individual's mother is twice that individual's number plus one. If your Ahnentafel number is 1, your father's is 2, and your mother's is 3. From the German Ahnen meaning ancestor, and Tafel, table or list.