-Pearl is the oldest and Jimmy is the youngest, with a 4 year age gap between Pearl and Grian and a 3 year age gap between Grian and Jimmy

-Their parents let Pearl and Grian come up with a name for Jimmy. Grian wanted to call him Tim at first, then Jim and finally Jimmy

-Their last name is Solidarity-Moon :D

-Despite how much they make fun of him, Pearl and Grian are incredibly protective over Jimmy and will not hesitate to fight anyone else who makes fun of him (it's a 'nobody can make fun of my little brother but me' kind of thing)

-Grian helped Jimmy learn how to fly- Pearl also has wings, but she has moth wings (as well as four wings) and wasn't sure she'd be able to teach him properly

-Pearl pretty much raised Grian and Jimmy after their parents died (😔) (lol angst)

-Pearl used to help Grian cheat on exams while Jimmy scolded them for it

-Jimmy constantly accuses Pearl and Grian of cheating whenever he loses at something, even if it's literally impossible to cheat at that thing

-Grian gets in (normally one-sided) arguments  with any of Jimmy or Pearl's partners, mostly consisting of disturbingly descriptive threats of what he'll do to them if they hurt his siblings.

-Jimmy and Pearl think it's cute that he's so protective but the detail in some of the threats are very concerning

-They often set each other challenges to see who can do something in the quickest amount of time. Pearl goes out of her way to beat Grian by around a couple of seconds just to annoy him, and Jimmy is nearly always last (they let him win sometimes though)