Brennan: I have to go back. I have a daughter.
Christine: I know how you feel. Once I had to leave my daughter behind too. I'm pretty sure it killed me.
Brennan: You had to leave us, mom. You did what you had to do for Russ and me. We understand.
Christine: No, see, this is your one small problem, is that you think that you can understand things that are simply not understandable.