Alright, here's a pic of Sunny's family.

(If you turn it so they are not sideways, it'll make sense)

Yakara (Star-shower), the oldest, is in the back, looking pretty bored. She is mentally 15 and usually serious.

Sunshine is to Yakara's left, waving happily at the camera. She is mentally 12, and peppy.

Sunny, on the bottom left,  is holding a bird. She is the "younger" twin sister. She is mentally 4, and is very energetic, but can't seem to pick up other languages as easy as her siblings can.

Nitefall (pronounced Nightfall) is holding Sunny's hand, on the bottom right, he is the "older" twin brother. He is mentally 5 and is very shy and calm, usually the opposite of Sunny when others are around, but by himself, he is almost as energetic.