Wilma receives a letter from her mother, stating that she's coming to live with them, but Fred immediately tries to find her a home to move into, away from him.
News of Wilma's mother coming to Bedrock in rather a permanent way has Fred desperate to find a home for his foul-tempered mother-in-law, as far from him as possible. While en route with Barney to Bedrock's golf course, Fred discovers an unkempt but adaptable house for sale and "bargains" with the real estate agent responsible for the site so that Fred buys building and property for $100, which includes water right purchase.
Fred expects to have no difficulty at renovating the dilapidated domicile, but the hired carpenter and plumber, both unionized and non-working at a $20-per-hour rate, unjustifiably ascend Fred's expense account. So, Fred and Barney themselves toil in improvements to the house. Wilma and Betty assume the worst (i.e. infidelity) when their mates constantly leave home to secretly labor on the problematic abode.
After their wives follow them to the site, Fred and Barney have no choice but to tell about Fred's plan to accommodate Wilma's mother in the rendered-presentable house. Wilma and Betty assist in the task. No sooner is the work completed then the artesian well on top of which the house is situated deluges it with water.
The house must be transported to a better location, and while in the act of wheeling it to the Flintstones' yard, Fred and Barney lose control of the structure, which tumbles down a ravine. Fred is in tears when he calculates his sum loss in Operation Mother-in-Law's House to be $1000- and Wilma's mother decides not to reside with the Flintstones after all!
- Fred Flintstone
- Wilma Flintstone
- Barney Rubble
- Betty Rubble
- Pebbles Flintstone
- Bamm-Bamm Rubble
- Pearl Slaghoople
- Alex (only appearance)
- Marvin (only appearance)
- Rocky (only appearance)
- Stoney (only appearance)
- Tessie (only appearance, no lines)
- Stoneage TV
- Chocolate cake slice (only appearance)
- Paste bucket (only appearance)
- Paste brush (only appearance)
- Wallpaper (only appearance)
- Golf clubs
- Barney's car
- Pearl Slaghoople's motorcycle (only appearance)
|Alan Reed||Fred Flintstone|
|Jean Vander Pyl|| Wilma Flintstone|
|Mel Blanc|| Barney Rubble|
|Gerry Johnson||Betty Rubble|
|Sam Edwards|| Mailman|
|Don Messick|| Bamm-Bamm Rubble|
|Janet Waldo||Pearl Slaghoople|
- The Flintstones' house number is 201.
- The title refers to the children's poem and repetition game, The House That Jack Built.
- None known.
|Season 6 of The Flintstones|
|"No Biz Like Show Biz" • "The House That Fred Built" • "The Return of Stony Curtis" • "Disorder in the Court" • "Circus Business" • "Samantha" • "The Great Gazoo" • "Rip Van Flintstone" • "The Gravelberry Pie King" • "The Stonefinger Caper" • "The Masquerade Party" • "Shinrock A Go-Go" • "Royal Rubble" • "Seeing Doubles" • "How to Pick a Fight with Your Wife Without Really Trying" • "Fred Goes Ape" • "The Long, Long, Long Weekend" • "Two Men on a Dinosaur" • "The Treasure of Sierra Madrock" • "Curtain Call at Bedrock" • "Boss for a Day" • "Fred's Island" • "Jealousy" • "Dripper" • "My Fair Freddy" • "The Story of Rocky's Raiders"|