Numb3rs Fanfic Finders

Hi I'm new here and I hope I'm doing this right.  I read a fic awhile ago and can't seem to find it again.  In this one Don goes away on some dangerous undercover mission thing. Charlie meanwhile has made friends with Ethan from Prime Suspect and is helping him with his project. (at least I think thats who it was).  Anyways he becomes friends with the family and ends up babysitting and stuff. I think the parents die when a tree falls on their car and Charlie ends up looking after the kid, adopting em maybe. I can't remember.  Don comes back and finds Charlies changed by the loss of his friends and from being suddenly thrust into parenthood. Can anyone please help me? For some reason I'm having a craving for this fic.