From Wikipedia

Helen Cohan (September 13, 1910 – September 14, 1996) was an American stage dancer and briefly a Hollywood film actress. She was the youngest daughter of vaudeville and Broadway legend George M. Cohan. She was born in New York City and studied at Marymount College in Tarrytown, New York and in France.

At the age of 17 Helen appeared as a dancer at New York's Heckscher Theatre in the 1928 Dance Recital produced by Ned Wayburn. Her first appearance on the stage came during the run of The Merry Malones at Erlanger's Theatre. She danced with her father for one performance. In 1931 she joined her dad in his play Fast Friendships. The previous season she played in the Kaufman-Lardner comedy, June Moon. Miss Cohan spent five months in Hollywood hoping to break into motion pictures before she was signed to a contract by Fox Film in 1930. Her film credits are few; she had roles in Kiss and Make-Up (1934), The Penal Code (1932), and Lightnin' (1930). The latter movie featured Will Rogers.