Brenda,
There were a lot of Benway/Benoit families in Quebec. It is possible that they were related. I don't know enough about this Benway family history to say for sure. I do know that on some of the church records that I found in Alburg they were listed under Benoit. As to who Frances Geroe was I have no idea. On the 1870 census for Alburg, Vt there is a Jerhu Benway listed age 80, I believe that this is Moses's mother. She also is listed as being from Canada. Could be the same person listed differently. Age would match.
Cheryl