(This should go by the first episode!)

You are the youngest child and secretly the most smartest kid of the Smith family. You(8), Morty(14) and Summer’s(17) grandpa Rick who is the smartest man in the universe liked you the most because you are like him when he was a kid and you were unbelievably smart for your age. In the morning during breakfast Morty starts falling asleep

Morty: maybe my dreams were to loud or something

Summer: or maybe you were out all night again with grandpa Rick.