What would te like season 5's main storyline to be about?

My Idea - Brennan goes to an foster agency for some reason.. She notices a girl in her eary teens (say 14) To everyones shock.. brennan adopts her. Turns out that girl is like a mini Bones like she has an interest in the lab and stuff. I just thought that would be a very strange and different twist to Bones. Where te get to see the nurturing side of Brennan.