Choose a file exported from a spreadsheet. This adds to the tree — matching IDs are updated, new IDs are added.
Birth Year or birth_year both work):id · first_name · last_name · sex · birth_year · death_year · birth_place · father_id · mother_id · spouse_id · notesid is required and must be unique per person — everything else links back to it. spouse_id can hold multiple ids separated by ;.