kinsman (n.) Look up kinsman at
"man of the same race or family; one related by blood," c. 1200, kenesmen, from late Old English cynnes mannum; see kin + man. Kinswoman is recorded from c. 1400. "The word is commonly and properly used only of a relative by blood, in contradistinction to relatives by marriage, who are properly termed affines" [Century Dictionary, 1902].