All posts by Julia, Librarian

Power-Up SIG Notes: Genealogical Numbering Systems

    • Why?
      • Primarily – Written family histories
      • For some – filing systems
    • Systems
      • Ahnentafel (ON en TAH full) (ancestor table)
        • For numbering ancestors in a pedigree chart
        • Base person is 1. Father is 2. Mother is 3.
        • Any person’s (n) father is n x 2 and mother is n x 2 + 1
        • No numbers for anyone else
        • If you want to sound extra geeky, call it the Sosa-Stradonitz System
      • Dollarhide (William Dollarhide)
        • Adds to Ahnentafel for other descendants
        • Base person’s grandfather is 4.0. His siblings are 4.1, 4.2, 4.3
        • Has additional characters for step, half, second marriage, etc
      • Register (New England Historic and Genealogical Society Register)
        • For numbering descendants
        • Only people with descendants get a number
      • NGSQ or Modified Register (National Genealogical Society Quarterly)
        • Everyone gets a number
      • Henry (Reginald Henry)
        • Base person is 1.
        • Children get parent’s number plus an extra digit at end (11, 12, 13, 111, 112, 113…)
        • Problems with more than 9 kids!  (some use X, A, B, C, some use (10))
      • D’Aboville (Jaques d’Aboville)
        • Used a lot in France
        • Like Henry, but uses periods between generations (1, 1.1, 1.2, 1.1.1, 1.1.2…)
      • Meurgey de Tupigny (Jacues Muergey de Tupigny)
        • Generations get Roman numeral, individuals get numbers
        • I, II-1, II-2, III-1, III-3
      • De Villiers/Pama
        • Like MdT but uses letters instead of Roman numerals
        • A, B-1, B-2, B-1.C-1, B-1.C-2, B-2.C-3
        • Used in South Africa