The Noceda Siblings are Luz(a human), Hunter(a grimwalker), and Vee(a basilisk). Luz is Camila’s real daughter, Vee got adopted by Camila, and Hunter was considered family. These three are also apart of the Hexside squad and share a sinking dynamic in which the fandom considers them as siblings. Hence, the name was “Noceda Siblings”.
These three were known as siblings due to the episode: Thanks to Them.
"Thanks to Them" is the forty-first episode of The Owl House, Season 3 Episode 1.