Genealogy Numbering Systems
Numbering systems for ancestors follow standard patterns:
Numbers go back from an individual (#1) with the male numbers being even and the female numbers odd. If I am #1, my father is #2, my mother#3. My paternal grandfather #4 my paternal grandmother #5... etc. Often the lineage is laid out on a pedigree chart, but it may be a simple listing, with each line numbered. This numbering system is called an ahnentafel (or Sosa-Stradonitz)
Numbering systems for descendants vary more substantially, but most genealogies now adhere to one of two similar systems: The Register System or the Modified Register/NGS system. There are versions of another system, called the Henry System used in some published genealogies. And genealogists keep trying to invent new and better systems... but there is no perfect system and in the case of genealogical writing, variety breeds confusion.