The Ultimate Computer

The Ultimate Computer stood at the end of the Ultimate Computer Company's production line. One day, a guided school tour arrived.
The salesman stepped forward to give his prepared demo. "This," he said, "is the Ultimate Computer. It will give an intelligent answer to any question you may care to ask it. Would anyone like to try?"
Little Johnny quickly stepped forward and asked, "Where is my father?"
There was the soft hum of powerful electronic gear going to the task. Panel lights lit and blinked, and within a couple of seconds the answer appeared on the screen: "Fishing in Florida."
Little Johnny laughed, "Actually, my father is dead! It was a trick question."
The salesman, quickly thinking on his feet, replied that he was sorry the answer was unsatisfactory, but as the Ultimate Computer was precise, perhaps a rewording of the question might work better.
Little Johnny thought and said to the Ultimate Computer, "Where is my mother's husband?" Again, the hum of the powerful electronic brain filled the room.
After a moment, the screen lit up with an answer: "Dead. But your father is still fishing in Florida."