The three brothers have finally been thrown out of their apartment. With nowhere else to go, the three go to the park. While there, they overhear a mother reading "The Three Little Pigs" to her child, and the three brothers attempt to recreate the house-building techniques from the book...
So they had no choice but 
to build their own houses.
Así que tuvieron que 
construirla ellos mismos.
Así que tuvieron que construirla ellos mismos.
Então o jeito foi construir
 suas próprias casas.