Arthur Marx, the little boy on Groucho's lap in the photo, died two weeks ago at the age of 89. He was named after Groucho's brother Arthur, also known as Harpo. I first knew of Marx's work as a writer through his two books about his father- Life with Groucho and Son of Groucho. But in addition to some Bob Hope film vehicles and a Broadway play (The Impossible Years, co-written with his frequent partner Robert Fisher), he worked on a lot of TV shows: McHale's Navy, Petticoat Junction, My Three Sons, All in the Family, The Jeffersons, Maude and Alice. We recently saw the movie of McHale's Navy, and boy is the original better (not that I've seen it in decades). Link to the NY Times obituary above.