The possessive form for the Marx Brothers is the Marx Brothers'.example: The Marx Brothers' nonsense is still popular today..
Groucho
In the ideas of Karl Marx
Marco Marx of the Marx Brothers
No.
Movies about the Marx brothers have not been made because they parted ways with the Paramount.
Marx Brothers
No. However the Marx brothers did star in "A Night in Casablanca"
They were Jewish.
No.
There are four Marx brothers in the 1932 comedy: Groucho, Harpo, Chico and Zeppo.
The Unknown Marx Brothers - 1993 TV is rated/received certificates of: Spain:T