A couple of closing thoughts.

Genealogy is a big deal in certain circles. Thus official registries. And it matters not at all whether you believe me either, but those aren't kept for curiosities sake, despite what you might choose to think.

Royals tend to intermarry while bastard children haven't tended to be registered. Meaning most of us are not related to the royals.

This is one of those subjects that reminds of on-going battles with those near if not always dear, which has innumerable examples but put quite simply, details matter.