A male person who has the same father and mother with another person, or who has one of them only. In the latter case he is more definitely called a half brother, or brother of the half blood. Note: A brother having the same mother but different fathers is called a uterine brother, and one having the same father but a different mother is called an agnate brother, or in (Law) a consanguine brother. A brother having the same father and mother is called a brother-german or full brother. The same modifying terms are applied to sister or sibling. "Two of us in the churchyard lie, My sister and my brother."