The Flintstones: Season 3, Episode 21 - ProjectFreeTV

3 - 21: Foxy Grandma

After his mother-in-law leaves, Fred goes through three housekeepers and finally finds an elderly lady that he is happy with. This sweet old lady turns out to be bank robber Grandma Dynamite. In the end Fred's mother-in-law returns only to be mistaken for Grandma Dynamite.