drayo on Family Tree Circles

John Wilson Osborne born about 1875 in South Carolina. He married Amanda Ard around 1923. He is on the 1910 census living in South Carolina. On the 1920 Census living in Bladen County North Carolina. Cannot find a 1930 census with his name or wife. His death certificate shows he died in Saint Pauls NC, Jan 25 1940. His wife is shown on there spelled Mander. It reads "unknown" for his mother and father. What can I do to find his mother and fathers names?