Hi Anne, The first Desrosiers that pioneered Québec was Antoine. As I mentioned in his notes "Four of his sons were involved in the commerce of fur-trading. As was the custom in those days, each of the boys took a unique "dit" (aka) name.This alias name distinguished their individual families."
In my report they all show up under “Children of Antoine Desrosiers and Anne Leneuf”. Michel Desrosiers-dit-Desilets Jean Desrosiers-dit-Dutremble Antoine Desrosiers-dit-LaFresniere Pierre Desrosiers-dit-Dutremble.
So you are a decendant of either Jean or Pierre and of course their parents Antoine Desrosiers and Anne LeNeuf.