Three Little Pigs

House 1
1's house was made of straw, had 1 window, 1 tree, and a number 1 on the door

Then came The Big Bad Squre, who blew that house down.

House 2
2's house was made of sticks, had 2 windows, 2 trees and a number 2 on the door.

The Big bad square came and blew it down again.

1 + 1 = 2

House 3
3's house had 3 rooms, 3 trees, 3 windows, 3 flags, a number 3 on the and 3 turrets.

1 and 2 came to the 3rd house.

The big bad square wasn't supposed to blow down the house, but he did

1 + 1 + 1 = 3

Intermission
1 + 1 + 1 + 1 = 4

3 wonders where the pigs will live now, but 4 says they can live in his house

House 4
4's house had 4 trees, 4 windows and a number 4 on the door.