The title of this episode has nothing to do with the plot but the tail ending, when it's established that the Flintstones will be having a baby. The plot actually begins when Fred resents Barney spending so much time taking care of his nephew Marblehead to the point their friendship nearly ends a few times. Then at the end of the show Wilma informs Fred that they are now expecting their own child. Fred is surprisingly happy to hear it.

Mother-in-law visits to help get Wilma ready for the new baby and Fred is miserable. Fred takes a job as a cab driver in disguise and makes all his money for a night driving his mother-in-law around and she finds out in the end and beats him up.

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.