The rat thinks of himself growing bigger.
He starts to grow, growing bigger then a human but it still is growing. It soon grows to the size of the room and its still growing. The father runs out of the house and looks in bedroom window of his son room as the rat is growing in his room. Then his mother and his other son come running out of the house. They see the rat grow so big that it destroys the house. The rat has stopped growing and is coming out the rubble and looks at the humans.
The rat wanted to show what a game of cat and mouse is like with the humans as the mice and the rat as the cat
So the rat chased after the humans.
The rat grabbed the father and put him in his mouth and swallows him whole. The rat then crushes the mother hard, killing her. Then the rat picked the mother up and put her body in his mouth and chewed her to a paste and swallowed.
The father was covered in the mush that was chewed up wife and rat spit mixed together thoroughly.
The rat then went to the boy. Even though he was sadistic, the rat grew the boy back but kept him as a hostage. A forced adoption as the boy had no parents to go to now
The rat threw the boy who he named squeak on his back and thought of his next decision