Looking for Prock Family of Texas and OR Missouri

My dear little paternal grandmother, whose maiden name was Bertha Ann PROCK (D.O.B. 01/02/1889), had other siblings but I can only remember her sister Hannah. Bertha Ann PROCK, birth state unknown, married Andrew Ervin HUMPHREY (D.O.B. 10/12/1886). Alpha Hazel (married name Mayo), George A. (D.O.B. 04/04/1909), Francis Murl, Douglas, Donald and Wayne HUMPHREY are their children.

I am the oldest child of Francis Murl HUMPHREY and Leona Virginia STEPP.

I would love to find out more about the PROCK family.