The St Clair's (Sinclair's) of Northern Maine and Canada

I am researching the St Clair family line starting with my great grandfather Vital whose first wife, my great grandmother, was Marie Masse whom he married on September 26, 1887 in Lewiston, Maine. They had four children, Nelson, my grandfather, Henry, Ida, and Antoinette. Vital's parents were Jean St Clair and Marie Ayotte of Frenchville, Maine. They were married on April 25, 1854. Jean's parents were Jacob Sinclair and Marcelline Sirois who were married on Nov 23, 1824 in Rimouski, Quebec, Canada. If anyone can add any information or point me in the wright direction I would be very grateful.