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Ahnentafel Report (Borland Genetics)

From ISOGG Wiki

The Ahnentafel Report tool in the Borland Genetics Web Tools and Database generates an Ahnentafel report for a profile.

An Ahnentafel (German for "ancestor table") is a genealogical numbering system for listing a person's direct ancestors in a fixed sequence of ascent. The subject of the ahnentafel is listed as No. 1, the subject's father as No. 2 and the mother as No. 3, the paternal grandparents as No. 4 and No. 5 and the maternal grandparents as No. 6 and No. 7, and so on, back through the generations. Apart from No. 1, who can be male or female, all even-numbered persons are male, and all odd-numbered persons are female. In this schema, the number of any person's father is double the person's number, and a person's mother is double the person's number plus one. Using this definition of numeration, one can derive some basic information about individuals who are listed without additional research.


The report was added to the Borland Genetics site during the 2021 Rolling Spring Features Release.

Tool Attributes

Category: Family Tree

Access: Free


Location on site: Profile Toolbox, accessed from the Profile Settings and Tools screen