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  2. Genealogical numbering systems - Wikipedia

    en.wikipedia.org/wiki/Genealogical_numbering_systems

    Ahnentafel, also known as the Eytzinger Method, Sosa Method, and Sosa-Stradonitz Method, allows for the numbering of ancestors beginning with a descendant. This system allows one to derive an ancestor's number without compiling the complete list, and allows one to derive an ancestor's relationship based on their number.

  3. Language family - Wikipedia

    en.wikipedia.org/wiki/Language_family

    This is an accepted version of this page This is the latest accepted revision, reviewed on 6 January 2025. Group of languages related through a common ancestor 2005 map of the contemporary distribution of the world's primary language families A language family is a group of languages related through descent from a common ancestor, called the proto-language of that family. The term family is a ...