There's Something Major Going Down On Tracy...
Emilia Grey is the daughter of billionaire ex-astronaut James Grey, one of the first men to walk on Mars. She grew up on Tracy Island with her parents' best friends, Jeff and Lucille Tracy and their 5 sons; Scott, John, Virgil, Gordon and Alan.
When a family holiday goes wrong, the two families work together to create a secret organisation that could prevent other families going through the same thing. All the while Emilia and Scott are trying to figure out how to date, live together and work together.
[Thunderbirds Origin Story]
~DISCLAIMER~ I don't own Thunderbirds or anything to do with them, this is just me imagining myself in their world.