Peppa and George visit Granny Pig and Grandpa Pig's house, and Grandpa Pig builds a treehouse.
The episode starts as The Pigs get out of the car and head to Granny and Grandpa pig's house. Peppa and George at happy to see them. Granny Pig tells them that they must take their boots off before coming inside. Then Granny Pig shows everyone the curtains and Peppa asks what they were for but Granny Pig said it was a surprise. They then head outside and see Grandpa Pig putting the roof on the treehouse. Peppa asks if the treehouse was for her and George and Grandpa Pig says yes. He then asks who wants to get in first, Peppa agrees. Peppa remembers that she must take her boots off before going into the treehouse. Then Daddy Pig asks George if he wants to go in the tree too, George snorts. Peppa tells him to take his boots off. George goes up to the door and knocks, Peppa asks who it was and she sees it's George and let's him in. Then Mummy Pig knocks and asks can there be visitors? Peppa tells her that she has to say the secret word. Peppa whispers it in her ear. Then Mummy says Daddy's big tummy. Then Daddy rubs his belly while everyone giggles. Daddy Pig thinks they were silly secret words. Then Peppa tells Mummy Pig to take off her boots. Then she heads inside. Peppa said that there was also room for Daddy Pig.
- The secret word to get into the Tree House is "Daddy's big tummy"
- This is the first appearance of the treehouse