 His brother was Henry Winterfeld, an author of children's books.Sometimes described as a "divided author", his early depression-era poem "Stempellied" about living on the dole was set to music by Hanns Eisler.But "Am Sonntag will mein Süsser mit mir segeln gehen" ("On Sunday I'll go sailing with my Sweetheart") and "Das gibt's nur einmal" ("It Happens Only Once"), became his better known work.