Ghostly’s and Flux’s kids but as adults!
Belle (one on the left) will inherit Flux’s hive when she becomes of age and succeed him as Queen when he retires. She gets the throne because she is the oldest but also because she is more changeling than her siblings. Able to shape shift just as well as any pure changeling and thus able to successfully create a link with her bug subjects; something her siblings can’t do. Like her father, she prefers an earthpony disguise. Her cutie mark is earned, like a regular pony, and represents her talent for music. Singing in particular, but she has a natural knack for almost all intruments.
Sugar (the one in the center) unfortunately becomes a lot like her dad as she grows older. A bitter sass master to everyone, except unlike her father she never gets that one person that becomes her soft spot. She is equal amounts of changeling and wendigo and because of this both traits cancel out and she is the only ‘normal’ pony in the family. She encounters someone later in her life to turn her into a vampire. She’s always hated how she was the only normal pony, so she considers vampirism a literal gift. Her cutie mark is a spiderweb stained with blood, it showcases her talent with the dead. As in, she can tell how a person died and when especially so with violent deaths; she’ll be a good detective. For obvious reasons, she earns her mark in her late teens–extremely late for most ponies.
Icey (one on the right) is the polar opposite of Belle, and is more wendigo than changeling. He can shift similarly to how Ghostly can and can control ice and snow on will as well. As a child and teen he can hardly control his wendigo side and because of this he’ll be a very angry kid. He calms down as he becomes an adult, especially so when he isolates himself for a few years to actually learn how to control his icey side. And even more so when he marries. His cutie mark is an anvil with a (poorly drawn) snowflake above it. It represents his skill with a forge. While ponies may not need swords or steel created by a blacksmith anymore, it’s still required with some things. Things made by him tend to last longer than when manufactured by a factory, as well. He will probably be the go-to blacksmith for Guards’ armor.