Pebbles and Bamm-Bamm, now married, soon become blessed: Pebbles is pregnant, so the Flintstones and the Rubbles go to Hollyrock and stay with them. Fred's rented a new RV for the occasion. Wilma, Betty and Fred fuss over poor pregnant Pebbles, and won't give her a moment's peace. The excitement of being grandparents is strong, also along is old lady Pearl Slaghoople, Wilma's mom and the new Great Grandmother to Pebbles and Bamm-Bamm's kids.

A caveless kid comes to live with the Flintstones on Christmas and ends up geting himself and Fred stuck in prison right before Fred is going to play Santa Claus in the Bedrock parade.