Teddy is my brother. He is younger than I am. He is bigger than I am. He doesn't weigh as much.(single sentence)
Teddy is my younger brother who is bigger than I am but doesn't weigh as much.
Teddy is my brother. He is younger than I am. He is bigger than I am. He doesn't weigh as much.(single sentence)
Teddy is my younger brother who is bigger than I am but doesn't weigh as much.