Ahnentafel is German for Ancestor Chart. It is a method of listing your ancestors in a concise manner. You start with yourself as number 1, your father is number 2 and your mother is number 3. The father of each individual is always double their number, and the father's spouse is always the next number. It is easy to go up and down the chart by multiplying or dividing by two.

3 June 2001