> How on earth do you go about genealogy data?

My extremely naive approach would a scheme where you have a header containing a list of used types of information fields, then a list of entries for people, then relationships (genealogical descendants, familial relationships with a start and end date (optional, YMD format, that you only fill in with as far as you know, so if you only know the year, you just set that.)) then a list of various events, then a list of supporting documents with a confidence value, where each document has a list of people and a list of events they are relevant to. then a list of basically freeform fields, that can link to events, documents, people, etc. where the types are defined in the header.

typing this out at 2 in the morning, so sorry for the incoherence.