Census records show wife to be Maggie in 1910, Cora in 1920, and Leslie in 1930. Found reference to Leslie Margaret Shannon: however, headstone on joint grave shows Leslie B. Cockrum. Any suggestions?

In particular I am trying to determine Maggie's birth parents as she would be the birth mother of my father Frank James Cockrum born February 25, 1910 (as shown on his birth record, mother: Maggie Shannon).