T-Rex or Tyrannosaurus, is the child in a cool family.
History
Bart and Lisa met him when they were invited into 740 Evergreen Terrace. They were surprised to see all the obscure things that T-Rex had in his room and were even more shocked to find that he didn't own a TV. Bart, Lisa and T-Rex quickly became friends.
At T-Rex's birthday party, T-Rex mocked the present that Homer had made for him, and mocked Homer. Bart stood up for his father and attacked T-Rex, leading into a fight. This fight is what made the two families stop being friends.
Later, after Bart and T-Rex had forgiven each other, Bart asked T-Rex if he wanted to come to his to watch The Krusty the Clown Show. T-Rex said that he had to stir compost but Bart persuaded him to leave it. The compost started to burn and set fire to the Devil Donuts truck. After this, T-Rex and his family left Springfield.
T-Rex's room
Personality
T-Rex seems to be nasty around his friends, as seen when he mocked Homer. However, he doesn't seem to hold grudged for long and knows when he is in the wrong and accepts it.
