My son also descends from William Kerby and his second wife Barbara through their son Andrew Jackson Kerby and his first wife, Ella(Ellen) Thorn(e). Andrew's son, Charles Norfolk Kerby and wife, Mamie Barrett were my son's great grandparents.
Charles Norfolk Kerby had a sister named Florence b abt 1898- was this Florence your wife's great Aunt?
I would be interested in sharing Kerby family info with you. At this time, my info is from William down to present time.