Glad your neighbour returned safe and sound, Critical. I agree with Gutmutter- the car keys should be taken away. He could have hurt himself or others if he was disoriented. Not that that is your place to say, anyways. I'm sure his family is thrilled and will take good care of him.
Leo- it sucks to be in the middle. And your friends will probably get mad at you for taking sides or for not taking sides! I agree with dberk - you should just lie low and let it blow over, simmer down, whatever.