This idea emerged from long ago as I grew up in a large family and had many relatives on both sides (I have yet to count them up but plan to before long plus I know a Mormon person has charted not only the recent generations but a couple or more prior generations. There are family trees and geneograms and ethnograms to chart things like relationships, changes in status of relationships, even health issues to be aware of familial risks or attributes.
) I studied social psychology at Vassar in the 1980s and it was a given when 'doing a study' to notate male and female subjects (why not just