This is the present. Stone was 15 to 16 years old. Avrille was probably in her 20s. Mar, their adopted sister was 14 to 15 years old. Of course. Mar was adopted when she was five months old back then when Avrille was 15 and Stone was 11.

Avrille: "Oh my god, why are you like, so edgy?"

Stone: "Why are you like, so obnoxious?"

And yes. Stone, and Avrille are Mar's only two older Irish siblings and Mar is their only American sister.