The d'Aboville System is a descending numbering method developed by Jacques d'Aboville in 1940 that is very similar to the Henry System, widely used in France. It can be organized either by generation or not. It differs from the Henry System in that periods are used to separate the generations and no changes in numbering are needed for families with more than nine children. For example:
The general description of the d’Aboville System at the top of the page, and the sample generic chart on the left above is adapted from Wikipedia: Genealogical Numbering Systems. The sample Higdon chart on the right is adapted from the genealogical register report starting on page 263 of Descendants of John Higdon and Millicent 1657-1998, by Gena Lee Theiss.
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