While you are waiting for Dorothy to reply, I have a little information. Alex b. 1852, and Alfred b. 1869, and Isadore b. 1865 are brothers. Parents unknown.
Isadore married Lucy Pauze. He died in 1950 and is buried in Xavier Cemetery, Renfrew, Ontario. Lucy died in 1956.
The only child Isadore and Lucy has, that I have listed, is Ambrose born in 1891. Ambrose married Veronica Stufko, but I guess you already have this information from Dorothy. She has some really good information on her family.
I am also attaching a photo of Alex Leblanc Sr.'s gravestone. He was buried in St. James Cemetery in Eganville.