When they have 9-11 years old and long before the New Guardians were formed, the girls still are friends, daughters of The Heroes of Mobius have a tight relationship. Princess Sonia Acorn, Belle D'Coolette, Misty Lowe and Lara-Su of House Edmund. Sonia, Misty and Lara-Su have the powers that inherited of their fathers. Solas, Jacques and Locke Jr. have too some friendship.
The age of the girls. Belle is 11 Sonia is 9 Lara-Su and Misty are 10.