Clare was son of William and Sarah Stewart. He was twin brother to Clyde H. Stewart. Both served in Spanish American War in the Rough Riders regiment.
(1880 Census-Richmond, Nemaha Co, KS) W. W. Stewart 44-NY-head S. A. Stewart 40-NY-spouse Charles Stewart 20-MI-son Flora Stewart 16-NY-dau Stella Stewart 14-NY-dau Wallace Stewart 12-KS-son Lenore Stewart 9-KS-dau Jessie Stewart 5-KS-dau Clara Stewart 2-KS-(twin son) Clyde Stewart 2-KS-(twin son)
(1900 Census - Pawnee, OK) Sarah Stewart 60-NY-head Charles H Stewart 39-MI-son Bertha Stewart 29-PA (dau-in-law) Wallace Stewart 32-KS-son Lenore M Stewart 29-KS-dau Clyde H Stewart 22-KS-son