Sisters with the famous trio Lara Jean, Margot covey,and kitty song covey. You were best friends with ur sister because that’s what you guys did you were older then kitty but younger then Lara Jean so I’d say 15 was ur age u were especially close with kitty because that was ur little sister and u were “the besties” yes she gave it a title because that’s how kitty was,ur bestie.yes it might be cringe but it was real and margo left to college already then was Lara Jean so you to stuck.