If he becomes Chatty Cathy, listen and listen closely. They love to chat about anything and everything and if you really listen, he may tell you things that you weren't even aware. Nod, smile and validate. I know that this will make you angry, but trust me, you need to become the best actress that you can be when you are around him. Once he's gone, scream all you want of beat the stuffing's out of a pillow.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.