Seems like Fred Astaire's legendary moves were genetic.
This photo captures the actor and dancer mid-swing with his son, Fred Jr., for a 1941 issue of Life magazine. Though Fred Jr. would later appear in 1969's "Midas Run" with his father, he put away his dance shoes for a life as a rancher in California. Fred Astaire died of pneumonia in 1987.
(h/t Reddit user thetoristori)