 Mary was a niece of his law partner, J. Allen Barber, and a descendant of Aaron Burr.Their first child was George Burr Clementson, who followed in his father's footsteps, establishing his own law practice in Lancaster; within three years of his 1892 graduation from Cornell Law School, George B. Clementson had authored the first treatise on bicycle law.Clementson died in Lancaster on March 30, 1920.