(I'll play the foster father while Greg because Greg won't be doing anything till I figure out something...)
Greg walked into the break room and found Catherine sitting at the table with her head in her hands. "Catherine?" He asked, "I uh, well just so you know I'm taking your side, Grissom should have been there for you. I talked to him and he seems... Actually I don't know, he doesn't really show a lot of emotion." He sat down beside her, "But I'm sorry for what happened, and I hope your okay." He said with a sheepish grin, "And if it makes you feel better you can go and interrogate the foster father all you want and get him to cough up what really happened, you'll do better then I did."