Try putting Morford in the Brides search.
Audrey married Lawrence Pederson 7/30/1954
Betty Jo married Joseph Grant 3/0/1951
Virginia married Ralph Edward Sader
Margaret didn't married. She and is buried in Mound Grove cemetery in Independence, MO. Also Betty Jo, Virginia and her parents are there.
My guess is it was Audrey as she was married at 17 and her mother has to sign for her.