You have been experiment/test subject for a few years now and Barnaby is like a father figure to you(you call him dad/pa)and always comes to see you/let's you stay in his lab one day you walk over to his lab and knock on the door when you step inside you see him working on Walden's(boss of the Rainbow Factory) prosthetic arm also Walden is in a chair nearby he looks pissed off

Barnaby: “oh, hey there kid how you doing? Is everything alright? Sorry i didn't see you yesterday I've been busy ”