r0b0tf4c3
If you still regularly use Wattpad, I made this one-shot. It's based off a fan theory from 2016/2017/2018 that Lincoln, Lucy and Lily are the only real siblings. It's kind of based off your story idea too. Hope you enjoy!
https://www.wattpad.com/1477930398-ideas-notes-sketches-other-stuff-like-that-one