I thought as much. I just wondered momentarily if i'd missed something!
Someone should really do a proper fanfic about W's parents. As RSL said:

Wilson is a very strange man,” the actor said, matter-of-factly. “People seem to overlook this. They seem to think he’s this normal, teddy bear of a guy. He’s very strange. He has three ex-wives. He lives alone, well now he lives with House. He deals with death every day. He has a schizophrenic homeless brother. God only knows what his parents are like. I think he’s a really strange, dark guy. That’s my take on him.