You must talk with Mom when she is drinking in the dining room and she will explain things, but you have to collect whiskey bottle first from the dining room cabinet- look up in walkthroughDidn't he say that his mom said that his dad couldn't father kids? That doesn't mean that his mom can't have kids so his notion that he is adopted because of that is kind of a big leap. Just means his mom screwed someone else and got knocked up. Unless I misread something.