I agree that there is not positive proof that Benjamin Miller was the son of James Miller & Frances Blay, but this assumption was made by the late Al Sierens, who was quite an expert in local catholic families. There is definitely circumstantial evidence. According to his CW record Benjamin was born in Mount Clemens, and you know he was part of the french canadian catholic community. The only Miller living in the area that fits the profile was James (Jaque) Miller. James is found in Denissen, but the baptism of his children is not carried forward far enough for Benjamin. His neighbors on the 1830 census included John B Thomas (Benjamin's future father in law) and Louis DeHate whose son Dominic married Mary Louise Miller, a proven dau of James & Frances. Benjamin's first son was Benjamin & his second was named James. Both Benjamin & Louise belonged to St.Peter Catholic Church and their children were baptized there. You will not find your proof at the Library, but you might at the Courthouse. One set of books I would examine are the Supervisor's Records which date back to 1828. There are no indexes available, but I have seen items listing payment to people caring for others. Another thing I would do is to try to locate the records of the catholic missionary who remarried Benjamin in Dec 1857. Have you checked the DSGR Magazines which as published a goldmine of information about the Detroit area. Another source would be the Detroit Free Press database by Proquest that goes back to 1831.