A man went to New York on a business trip... When the trip was over, he took a cab to get to the airport. The cab driver decided to have a little fun at the man's expense, so he asked, ""My mother had three kids, one was my brother, one was my sister, who was the third?"" The passenger had no idea. The driver replied, ""The third one was ME!"" The man went home to his wife and said to her. ""Hey honey, here's a riddle for you. My mother had three kids, one was my brother, one was my sister, who …