If you search on www.familysearch.org
There is a Graham Roberts in the 1910 and 1920 census for Abingdon, Washington County, Virginia. He is living with his Step father and his Mother, John C. Young and India Young. Graham appears in the 1920 and 1930 censuses in Meigs County Tennessee with his wife.
Do you know India's maiden name? That might help locate her marriage to Graham's father.