Written Script, little brother of Ditzy Doo gets a call one day. His sister is in the hospital and there's nopony to take care of little Dinky. He catches the first train to Ponyville where he meets one of his sister's friends Carrot Top. The severity of Derpy's condition put's Dinky's future in there hooves.
Written plans on taking Dinky back to live with him in Detrot but that might not be what's best for Dinky and Derpy. Or Carrot Top either. But it is better than the alternative. He won't let his niece become an orphan in the system.

Written Script is the stallion's name [according to unicorn names wiki] and the character Sparkle is the unicorn who was entered with Dinky in the Sisterhood Social.
Please don't hate me for the reason Derpy's not well. I did it in a way that says she's not 100% there but you're still an arse if you're mean to her.

Basiclly, from the latest episode [Just For Side-Kicks] I don't accept the theory that Carrot top is Dinky's mother and I wrote this to justify my head-canon.
Also my internet died for two days so I had nothing better to do than write this.

Pic simi-related.