Prudie was the daughter of W.J.J. "Jack" Scoggin and Sarah Choate Scoggin. She had 4 half-siblings: Zella, John F., William Edward, and Walter B. Scoggin. She married James Jefferson "Bud" Elder on 10 Oct 1882 in Karnes County, Texas. They had 3 sons, James M., Fayette, and Seidel Meyer Elder. Bud was a deputy sheriff in Helena, Texas and was killed,along with his brother and several other men, in a shoot-out. Prudie then married Robert Walker Derum on 16 Oct 1889 and they had 8 children: Anne, Irene Gertrude, Lee, Andrew, Grace May, Pauline, Joseph Walker, and Roberta. Irene, Lee, Andrew, and Grace died in infancy or early childhood. Prudie is buried in the Helena Cemetery.