Surname Saturday: Pierce, Grimes County Tx

Grandfather Charlie Pierce born around 1875 in Texas was first married to Gertrude Sims in Grimes County, Texas. They had two children Elo and Jimmie Ethel. Charlie's parents were John and Nancy (Johnson)Overstreet Pierce. The 1880 census tells me that Johns parents are from Alabama. John was born between 1825 and 1832 according to the census and Nancy was his 2nd wife. I am in the process of trying to locate John on the 1870 census possibly with his first wife,name unknown. I have been unable to find a Death certificate for John,Nancy or Charlie.