Hello
I believe that Isidore's parents were Louise Cossette and Catherine Trepanier and it was Louis Cossette who was apparently adopted in to the Cossette family. I haven't been able to learn anything further about that though. Isidore's baptism is on record in Quebec but Louis' is not.

Marie-Flore was born in Wild Rice in March 1870. I don't have a record for an Antonia Cossette but she could have been slightly earlier. Do you have her birth date? Can you add any further information to the Isidore Cossette family tree that I have at:
http://freepages.genealogy.rootsweb.ancestry.com/~cossettewi...

Any new info would be appreciated.

Tom