The Addams Family and The Munsters both ran for 2 seasons at the same time (1964-66). The producers of one of the shows, must have gotten the idea or concept, from the others' show. It poses the question, which came first, ABC's The Addams Family or CBS'The Munsters?:confused:

The Addams' Family was the first to air then The Munsters debuted the following week. Don't know if this is exactly what you're looking for but if not then I'm sure you'll get the right answer soon.

The people behind the Munsters were the first in the race. The first pilot with Joan Marshall was made in the fall of 1963. Charles Addams was approached to have his cartoons made into a TV series in early 1964.
From Steven Cox's book: "The Munsters was already in development by the fall of 1963 when David Levy of ABC decided to adapt Charles Addams's characters for a television sitcom. By February 1964, ABC had finalized a deal. ABC was originally interested in the Munsters, but for some reason was unable to acquire the property. Obviously, Addams became thier answer to CBS's upcoming Munsters."

That answers my question, thanx! I've wondered about this for years!