Lil' Cheese is the oldest sibling while Smart Cookie and Banana Cream Pie are twins, Smart Cookie is the oldest and Banana is the youngest twin. They also have a third brother Brownie Batter( wich I'm still designing him) that was born on the same day as them. Despite being born at the same day and time as his siblings and share the same birthday, they aren't triplets! Brownie is just a year younger than them and it was a funny coincidence.