This Reckless Age (1932)

Donald Ingals and his wife Eunice are conventional and loving parents who are shocked when their son Bradley comes home from college with ideas that they consider to be outrageous. His parents would like him to get involved with Mary Burke, a prim and proper young lady. More complications ensue because Bradley's sister Lois is attracted to the flapper lifestyle, but she isn't sure whether she can handle its emotional demands.