thanks for your answer. As far as I know, your grandfather Blaise had 6 children: Angela, Denise, Steve, Kenneth, Gordon and Raymond. Is that list complete? If so, I suppose one of them must be your mother or father.
About Louis Riel: Indeed, he has 1/8 Ducharme blood, if I may say so, as well as 1/8 Indian blood. Many Ducharme in Western provinces are Métis.