The April Fools
Starring Jack Lemmon, Catherine Deneuve, Peter Lawford, Jack Weston, Myrna Loy, Charles Boyer, Kenneth Mars, Melinda Dillon, Harvey Korman, Sally Kellerman
It's a drama and comedy movie, and has a rating of 6.1 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Germany.