Frankie Avalon married Kathryn “Kay” Diebel 19 January 1963.
Frankie Avalon had become friends with John Wayne’s son Michael while shooting The Alamo (1960) and Michael Wayne was married to Gretchen Diebel. Frankie met Gretchen’s sister Kathryn – a former beauty pageant winner – when playing cards at Michael Wayne’s house the same year.
Frankie and Kathryn’s first child, Frankie Avalon Junior, was born a respectable 9 months after their wedding on 29 September 1963, just seven weeks after the release of the original Beach Party movie. They have had seven more children, and now have ten grandchildren.