Consanguineus frater
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
In civil and feudal law. A half-brother by the father's side, as distinguished from frater uterinus, a brother by the mother's side. Consanguineus est quasi eodem sanguine natns.
Co. Litt 157.
A person related by consanguinity is, as It were, sprung from the same blood.