I agree with your posting. Alva Hubbard was the son of Jesse Hubbard, Sr. and Mary Codner, born about 1797 in Rutland County, Vermont. In land records of Vermont, Alva Hubbard gives rights of house to his parents Jesse and Mary Hubbard and receives a lease on the property, dated 1 March 1824. His parents were living in Middleton, Rutland, Vermont. In that record, Alva's name is spelled Alva and Alvey.
In the 1850 census of Middleton, Rutland, Vermont, Truman or Freeman Kilburn,age 45, and Elizabeth Kilburn age 34 are living with Matilda age 17, George age 13, Hannah, James, William, Edgar and George. The death record of Matilda Hubbard (dated 25 May 1907 in Brandon, Vermont) mentions that her mother was Elizabeth Spooner and her father was Freeman Kilburn. Maybe you have that record.
Thanks for your email address. Mine is firstname.lastname@example.org