He was the only child of Jacob Grant Hollenbeck (1867 – May 2, 1939), the ticket-clerk son of a grocer from an Indiana farming family, and his wife, the former Mabel A. Parmelee (Parmalee or Parmallee; March 24, 1869 – October 17, 1960), the daughter of David Parmelee, a railroad conductor.
Los padres de Webb eran Jacob Grant Hollenbeck (1867 – 2 de mayo de 1939), hijo de un tendero de Indiana, y Mabelle A. Parmelee o Parmalee (24 de marzo de 1869–17 de octubre de 1960), hija de un maquinista de ferrocarril.WikiMatrix WikiMatrix