Numbering Ancestry numbering system Ahnentafel - Explained earlier with Pedigree Charts. This system does not allow for numbering descendants of siblings of your ancestors. This method is probably the most common. Descendancy numbering systems 1. Henry - first number gives the generation.
Second number is birth order of the parents' children.
This system will tell you what generation an individual is, by how many digits are in a number. With this system, letters are used when there are more than 9 children. Consecutively numbers every child of a given generation. Then it goes on to the first child of the next generation with then next number. This gives everyone a unique number, but does not allow for children found later on not previously known.