Those Calloways was a film that was released before The Happiest Millionaire.
Those Calloways is a 1965 American family drama film, adapted from the 1950 children's novel "Swiftwater" by Paul Annixter. 
The Happiest Millionaire is a 1967 musical film starring Fred MacMurray and based upon the true story of Philadelphia millionaire Anthony J. Drexel Biddle. 
