Other tidbits will bring great joy. Everyone is related to everyone. Mathematical calculations indicate everyone is no further apart then a 21 st cousin of everyone else. We think of the family tree as growing ever larger going back in time. The reality is that there were far fewer people.
Small communities result in fewer choices and closer inter-marriages.
The puzzle is best viewed in a diamond shape rather than as an upside down triangle. Don t forget the present. Personal records often omit the living. New families and children are springing up all the time. Tracking and adding them right away is much easier than at a later time.