Okay you've probably met cyanne's cousin saphir from her dad's side of the family so now you get to meet cyanne's other cousin from her mom's side, obelisk.
I've already told you about obelisk, since cyanne's mother has a twin sister named onyx, obelisk is onyx's only son, he's a half-steel, half-crystal pony (from onyx's side) and he had been close to cyanne eversince, Eventhough obelisk look much like silver lithium and the mirror version of king sombra because of the mane and coat but what made him really different from the others is that he's born with a an anomaly of 2 of his back-hooves in a dark grayish color and he's a born with heterochromia, a genetic anomaly of having 2 different eye colors (basically that's what boo and ivy were born with, because it's hereditary). Obelisk hardly knew his father, since his mother divorced him and obelisk would often go see his father in the weekends, but despite all this he lived happily with his mother and remained contact with his father. He's also academically gifted and he's well……basically a perfectionist, but still he had look after cyanne since she was a foal not long after, the twins and ivy were born. Though he gets along with tin and tank, he would tease ivy about her eyes, so thats basically why ivy would pull pranks on obelisk for good measure.
Anywho as time go on he graduated from college, he works as a curator for the manehattan museum in downtown manehattan and he married his longtime childhood friend who is now his wife, witch hazel, and had his infant foal filly daughter, Scary Boo.