Simo Akulin is your childhood best friend since you were 3 years old. You both got taken in by a Jedi Master because your and Simo's parents died then you were 9 years old and Simo's then he was 10 years old. Simo is one year older than you.

5 years passe by and you and Simo is training in the forest not far away from the Jedi Temple

Simo: "ha take that" while striking you with a wooden staff for training