 His other son, Paul Martin Castor (Jan. 9, 1914 in Washington, D.C. - Dec. 24, 1969 in La Jolla, California) was the Chief of Staff for Senator Robert A. Taft, Strom Thurmond, and Hiram Bingham III.He ran for the House of Representatives for California's 52nd congressional district as a Republican, but died before the election took place.Through his son William, Castor is the great-grandfather of both Pennsylvania Attorney General Bruce Castor and US Representative Kathy Castor.