A special reunion of The Addams Family cast from 1964 was broadcast on NBC, 11 years after the original show had been cancelled. Everyone returned to their roles, except for Blossom Rock as Grandmama, who was ill and passed away shortly after its broadcast. In this made-for-TV movie released for Halloween, Wednesday and Pugsley had grown up (allowing for the return of an older Loring and Weatherwax), but younger siblings “Wednesday Jr” and “Pugsley Jr” had been born in the intervening years.
Source
Owen, Dan. “AN ADDAMS FAMILY HISTORY.” Medium, Dans Media Digest, 9 Sept. 2017, dansmediadigest.co.uk/an-addams-family-history-eb270f90a19b.