Francoise, dau/Louis Dumouchel & Francoise, Indian 1700's

Trying to help someone research this family.Francoise, daughter of Louis and Francoise, married Antoine Granbois (Guilbaut) in St. Clair County, IL in Nov 1795 but they lived in Peoria.Records show she was previously married to a Pierre Duchaneau but no record found so far.
Antoine and Francoise had 3 children but both died when children were somewhat young.What happened to the children when the parents died? The family had moved to Ontario.
Any help greatly appreciated.
Sandi Bennett, Shiloh, IL