Do we do this based on events, or do we want explicit families?
In most cases, families are something that exists, but not always
Using the relations has less information duplication, but makes everything more difficult: how do we merge multiple events for the same family
Do we link family members to events, e.g. do parents get added to the birth event or baptism event, or do we add those to families instead? Or maybe to families, but we show family events?