Numb3rs Fanfic Finders

Hi, I'm looking for a fic I read a while ago where Don and Charlie have another brother. The brother (I cant remember his name) was some sort of government agent or something similar and something happened where he had to fake his death and Don, Alan, and everyone else all believe he is dead but only Charlie knows the truth because of his NSA consulting and security clearance. Don ends up finding out somehow that his brother is still alive and they end up sort of getting reacquainted with one another and I think Alan eventually finds out too. I think Ian Edgerton had something to do with Don finding out his brother is alive and Don gets mad at Ian maybe??? Anyone know what fic this is?