The last part to  kaafan10 's request, as it's Spitfire; the Wonderbolt's coach and leader, with her own son Firestorm. And you know the drill, it's story time.

On a sunny day in Cloudsdale, it was Firestorm's birthday; son of Spitfire due to Twilight's mishap pregnancy spell. However, she was fond of having her own filly, and was happy to raise one. She raised him during her couching, and even during her stunts in the process. She named him firestorm due to him being a storm in her home; breaking things, making a mess, the usual trouble making foal. However it was due to being
lonely, so another reason why Spitfire had him so closely while working. Now he was a filly, and a big fan of his mom's job, especially since she was the leader of the Wonderbolts. He would have every Wonderbolt item in his room; action figures, clothing, posters, and even diapers since everypony was wearing them at the time. Today for his birthday, he was super excited as his birthday present for today was a Wonderbolt onesie with matching booties. He was super static about it, that he flooded his diaper in the process from it. Spitfire chuckled and changes him into his Wonderbolt theme diapers, and then put him into the onesie and booties. He giggled happily, flapping his wings in joy. While he did that, Spitfire asked him if he wanna fly with his mom, which he answered yes. Soon after cake, they zoomed off into the sky and had a chat with each other.
"Like your new onesie, sport?" Spitfire asked.
"Yeah! It's awesome! Just what I wanted!" Firestorm giggled excitedly.
"Only the best for my son." She chuckled. The best flier in my family."
"Yeah! We're the best fliers than anypony!" Firestorm cheered, as Spitfire smirked.
"Let's not get ahead of ourselves. Ross and his mom Rainbow Dash are certainly faster than us."
"Oh, right.... I can't believe Miss Dash is faster than you mom."
"Same here sport."
"Yeah, but you'll always be the fastest to me." Spitfire felt honored from that, she smiled at him so proudly, and even gave her son a hug.
"I love you mommy." He said while hugging back.
"I love you too my little fire cake." Firestorm blushes, as that was his embarrassing nickname that his mom calls him.
He spoke while blushing, "Oh mom..!" She giggled, while they continue their flight and soon headed back home to finish off Firestorm's birthday party.
Hope you enjoy. ^^

Firestorm Info: Born by the most famous and Sargent of the Wonderbolt's, Spitfire. Ever since he was born, Spitfire has always gave him Wonderbolt themed items, clothing and diapers thanks to the discount of presenting the merchandises. Firestorm has never complained about getting another Wonderbolt item in his entire life. His body is slightly darker than his mom, his mane is styled to be a mohawk, and his eye color is amber, like Spitfire. The only item that wasn't given to him as a Wonderbolt themed merchandise was his necklace, Spitfire made that for her son to express that he is her true Wonderbolt. He's excitable, slightly stubborn on orders from others(Except his mother), and is fast enough to out fly his mom. Though his pride is easily ruined is his mommy cooes him.