Ahnentafel
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 list and allows one to derive an ancestor's relationship based on their number.
The number of a person's father is the double of their own number, and the number of a person's mother is the double of their own, plus one. For instance, if the number of John Smith is 10, his father is 20, and his mother is 21.
Helpful chart.
(First Generation)
1 Subject (me!)
(Second Generation)
2 Father
3 Mother
(Third Generation)
4 Father's father (Marlen S. M.)
5 Father's mother (Ruby E. Napper)
6 Mother's father (Malcolm G. S.)
7 Mother's mother (Mary Beaton Cox)
(Fourth Generation)
8 Father's father's father (Marlen E. M.)
9 Father's father's mother (Ruby E. Wade)
10 Father's mother's father (Gordon T. Napper)
11 Father's mother's mother (Winnifred G. Wade)
12 Mother's father's father (John S.)
13 Mother's father's mother (Edith E. Carter)
14 Mother's mother's father (Rowland H. Cox)
15 Mother's mother's mother (Mary C. Beaton)
(Fifth Generation)
paternal
16) 2G GF (Joseph A. M.)
17) 2G GM (Jennie McKeiver)
18) 2G GF (Sidney T. Wade)
19) 2G GM (Elizabeth Holloway)
20) 2G GF (John W. Napper)
21) 2G GM (Mary Ann Botting)
22) 2G GF (Joseph Wade) - same as #36
23) 2G GM (Harriet J. Swaffield) - same as #37
maternal
24) 2G GF (Thomas M. S.)
25) 2G GM (Susan S. Grant)
26) 2G GF (William Carter)
27) 2G GM (Elizabeth Simpson)
28) 2G GF (William C. Cox)
29) 2G GM (Emily M. Gardner)
30) 2G GF (Peter Beaton)
33) 3G GM (Corinne Aube)
34) 3G GF - adopted, brick wall
35) 3G GM - adopted, brick wall
36) 3G GF (Joseph Wade) - same as #22
37) 3G GM (Harriet J. Swaffield) - same as #23
38) 3G GF (Edmond Holloway)
39) 3G GM (Emma Puffett)
40) 3G GF (William Napper)
41) 3G GM (Harriott/Harriett Cooper)
42) 3G GF (Richard Botting)
43) 3G GM (Jane Cook)
44) 3G GF - Joseph Wade's father, unknown
45) 3G GM - Joseph Wade's mother, unknown
46) 3G GF (Charles Swaffield)
47) 3G GM (Eliza M. A. Copper)
maternal
48) 3G GF (John S.)
49) 3G GM (Euphemia G. Sampson)
50) 3G GF (William Grant)
51) 3G GM (Jane Lamb)
52) 3G GF (William Carter)
53) 3G GM (Hannah Morton)
54) 3G GF (Thomas Simpson)
55) 3G GM (Elizabeth Stapleson)
56) 3G GF (Charles Cox)
57) 3G GM (Margaret Ellen Cooling or Cowling)
58) 3G GF (William S. Gardener)
59) 3G GM - (Emma Harper)
60) 3G GF - Peter Beaton's father, unknown
61) 3G GM - Peter Beaton's mother, unknown
62) 3G GF (Duncan Campbell)
63) 3G GM (Anne McPherson)
