He is the great @-@ nephew of astronomer Clyde Tombaugh , the discoverer of Pluto . Kershaw 's mother , born Marianne Tombaugh , is the daughter of Clyde Tombaugh 's younger brother . His father , Christopher George Kershaw , was a musician and won a Clio Award for his work . The elder Kershaw remarried after his divorce from Marianne and died in 2013 .