Well, this is Valentine (or Strawberry; Big Mac and Fluttershy's daughter), Apple Crisp (or Crispin; Big Mac and Sugar Belle's son) and Sugar Rush (Sugar Belle and Party Favor's daughter).

These fellas look like they get along, but they don't really (not in a bad way, it's just that they all have their own different viewpoints and totally different jobs).

First off, Strawberry is a young veterinarian at 16. She also likes to grow strawberries. In her veterinarian work, she prefers to handle reptiles and amphibians. She's not much of a furry animal type. I mean, she herself has her own collection of snakes and lizards and frogs (mainly snakes). She started having this fascination of scaly and slimy animals when she got her first pet. It was an albino boa, in which she was named Ginger, and she loved her (and snakes and all) ever since.
Valentine is known as quiet, introverted, and yet quirky and observative. Some may find her weird and disgusting, but many will find her beautifully natural. Needless to say, she is soft spoken and did inherit a thick accent from her dear old Papa. She is the youngest sibling, and to be the youngest and pretty scrawny looking, she's actually REALLY strong. She also gets that super strength from her dad, and her tallness from her mother.

Second, Crispin is simply a baker, taking after his mom and working alongside her. He's really good at making apple crisp, and other apple desserts. He's the oldest, at 22, and loves both of his quirky siblings equally. He really has a big soft spot for his mom, and will cherish her no matter what. But his dad… he doesn't hate him or anything, he's just very intimidated by him and his muscles. And talking about muscles, Valentine wasn't the only one who got Big Mac's super strength. He might be chubby and fluffy and oh so gentle and kind, but he can heave up any obstacles in his way. He can even fend for himself too. And since he's rightfully gay, softand stubby, other stalliosns look down upon him… But don't underestimate him, because he will throw you into next year! He gets his chunky cute shortness from his momma.

And now finally, Sugar Rush. She's the middle child, at 17, and not much older than Valentine actually. She's a young, and successful hotspot comedian. She enjoys making others laugh and the endorsement that comes from it. Yeah, she can come off as cocky, narcissistic, and sarcastic most times, but that's what makes her, her. Though those personally traits come off as rude, somehow ponies like that about her, it makes her more comical and enjoyable. And besides her stand up comedy job, she also enjoys baking with her mom and brother, designing things with her dad, and hanging out with friends. She's short like her mom and brother too.

(Btw, the background in my picture isn't definitely mine 😅…. Obviously).