Mark Hamill brothers
Patrick Steven Hamill (September 3,1964),
William Thomas Hamill III MD (October 24,1944)
Mark Hamill sisters
Terry Suzanne Cornelius (June 12,1947),
Jan Leslie Hoover (September 4,1949),
Jeanie Diane Collins (October 23,1954),
Kim Michelle Suvia (February 24,
1959)