1910 U.S. Census (Ancestry.com): Henderson Clark (43) living in Oakland, Alameda Co., CA with wife, Laura (33 Nevada), married 16 yrs, 3 kids, 2 living, with sons, Leslie (15 CA) and dau., Ethel M. (11 CA).
1930 U.S. Census (Ancestry.com): Leslie Clark (35) living in Oakland, Alameda Co., CA with wife, Gertrude (35 CA), married 13 yrs and 3 kids: Donald (10 CA); Dorothy (7 CA); and Doris (4 CA).