And Benaiah
Bnayah (ben-aw-yaw')
Jah has built; Benajah, the name of twelve Israelites -- Benaiah.
the son
ben (bane)
a son (as a builder of the family name), in the widest sense (of literal and figurative relationship, including grandson, subject, nation, quality or condition, etc.
of Jehoiada
Yhowyada` (yeh-ho-yaw-daw')
Jehovah-known; Jehojada, the name of three Israelites -- Jehoiada.
was over both the Cherethites
Krethiy (ker-ay-thee')
a Kerethite or life-guardsman (only collectively in the singular as plural) -- Cherethims, Cherethites.
and the Pelethites
Plethiy (pel-ay-thee')
a courier (collectively) or official messenger -- Pelethites.
and David's
David (daw-veed')
loving; David, the youngest son of Jesse -- David.
sons
ben (bane)
a son (as a builder of the family name), in the widest sense (of literal and figurative relationship, including grandson, subject, nation, quality or condition, etc.
were chief rulers
kohen (ko-hane')
literally, one officiating, a priest; also (by courtesy) an acting priest (although a layman) -- chief ruler, own, priest, prince, principal officer.