The mare with blonde streaks is the eldest. She takes after her great-grandma, Surprise, more than either of her parents. She could care less about her royal status and just wants to hang out with her friends and have fun. Her talent is jewelry making.
 
The stallion is the middle child. Like his father, he’s a bit of a snob. He’s lazy and uses his status as a prince to force his friends to do things for him. Blueblood doesn’t see the problem, but Pinkie tries her best to teach her son that friendship is not something to be abused (he mostly ignores her, though).
 
The little filly is the youngest (obviously). She’s sort of a mixture of her parents. She has Pinkie’s hyperness and friend making skills, but also Blueblood’s selfishness.