Rarity and Maud’s relationship could be categorized as a slow burn romance. Maud Pie visited Ponyville often to spend time with her sister, Pinkie Pie, but when doing so she also took up work alongside Rarity in finding hidden gems buried within the old mines behind Sweet Apple Acres. While Maud was quiet and kept to herself, she was the perfect listener to Rarity Belle’s impressive ability to yap, and really quite enjoyed it. The two silently became a pair without much surprise to the ponies around them.
Maud Pie’s family is made up of mules (with the exception of Pinkie Pie who was adopted). The first and only born son of Rarity and Maud was a dashingly handsome little mule and unicorn hybrid; a mulicorn if you will. They named the little colt Celestine, even though there were options given by Maud such as “Boulder Jr.”, “Conglomerite Pie”, or even “Gravel”! It was never really a shock when Rarity nixed all of them and settled with “Celestine”.
Celestine is mute. He does not speak audibly and instead communicates with a form of sign language developed by ponies that includes stomping, ground scraping, snorting, ear flicking, etc. He also, like his mother Maud, is fairly expressionless most of the time, giving little to no facial expression to aid in his communications aside from expressing in moments of extremity or high emotion.
While Celestine seems to be boring, he actually has quite the social life. He’s the drummer of Retro Dash’s band “Mama’s Boy”, as well as runs an extremely popular salon that others travel out of the city to visit (if they book in advance!).