I realized that I made an error and wrote a message to correct it, but I posted my message in the wrong place. Please see that Robert A Martin 47 b. 1863 IL is James' cousin.
Do you have any Martin family members in your file?
http://genforum.genealogy.com/riggs/messages/3961.htmlhttp://genforum.genealogy.com/riggs/messages/3961.html 1910 United States Federal Census about James R Riggs Name: James R Riggs Age in 1910: 45 Estimated Birth Year: 1865 Birthplace: Missouri Relation to Head of House: Head Father's Birth Place: Illinois [Unknown] Mother's Birth Place: Missouri Spouse's Name: Lurani A Riggs Home in 1910: Bear Creek, Boone, Arkansas Marital Status: Married Race: White Gender: Male Neighbors: View others on page Household Members: Name Age James R Riggs 45 Lurani A Riggs 37 Mary Riggs 18 William T Riggs 17 S Ann Riggs 15 Marian F Riggs 14 Nerbie T Riggs 12 Howard S Riggs 10 Nora L Riggs 8 Malinda L Riggs 6 Henry Riggs 4 Josephine Riggs 1 9/12  Robert A Martin 47 Birthplace: Illinois Relation to Head of House: Cousin