Registration location?

[jlg]

Do you know if the commune where the births are registered must be the commune of the ancestor through which you qualify? Do they allow/reference alternate registrations with which the family came from? Or anywhere else for that matter. I ask because after generations no-one may know where to look. Also as we get further and further from 1948 for those going through mother to mother for eligibility may find themselves registered to the maternal side causing confusion.

-JLG