Here are 5 important dates in the history of French civil registration that will help you understand what records you will find for each period.
Here is a list of the names of French records as you can find them on archives websites. “Cadastre” / “Plans cadastraux” : land registers
Here is a list of family relationships that you can find in French records. “Frère utérin” / “Sœur utérine”: half-brother or half-sister with the same