He may be best remembered today for swapping families with fellow Yankee pitcher Mike Kekich, an arrangement the pair announced at spring training in March 1973. Peterson and Kekich had been inseparable friends since 1969; both families lived in New Jersey, their children were about the same age, and often they all would visit the Bronx Zoo or the shore or enjoy a picnic together. They decided that they would one day trade wives, children, and even dogs.
