"From left to right:
Icy Storm (Storm or Stormy)
Storm is the second son of RD and Soarin. He's super cool hence the name Icy Storm XD He's a lot more serious than his older brother. He's not nearly as cocky as him and already has big dreams and aspirations while Priz is a little more lax.
Night Light
Son of Twilight and Flash. He is kind of a worrywart and tends to overthink situations. He looks up to his older sister but is nothing like her. He wishes he was but it just doesn't happen XP He is very smart and is a lot like his mother unlike Starburst who is more like their father.
Cloudy Skies (Cloudy or Sky)
Kay, so this one is gonna need a lot of explaining XD First off she is the daughter of Pinkie Pie and Pokey Pierce. Yes, she is a pegasus. Why you ask?
1. In my headcanon, Surprise the pegasus is related to Pinkie somehow. So there are pegasus genes in her somewhere
2. I like the idea of a family with all three types of ponies like the Cakes
3. It's freaking Pinkie Pie's daughter! You can't tell Pinkie what kind of babies she can and cannot have!
Cloudy Skies, despite her names, is a very happy pony in general. She's a little sensitive when talked to a certain way by others but she forgives easily. She likes cheering people up although she's not as good at it as her mother or sister."