The 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.
of Joseph
Yowceph (yo-safe')
let him add (or perhaps simply active participle adding); Joseph, the name of seven Israelites -- Joseph.
after their families
mishpachah (mish-paw-khaw')
a family, i.e. circle of relatives; figuratively, a class (of persons), a species (of animals) or sort (of things); by extens. a tribe or people -- family, kind(-red).
were Manasseh
Mnashsheh (men-ash-sheh')
causing to forget; Menashsheh, a grandson of Jacob, also the tribe descended from him, and its territory -- Manasseh.
and Ephraim
'Ephrayim (ef-rah'-yim)
double fruit; Ephrajim, a son of Joseph; also the tribe descended from him, and its territory -- Ephraim, Ephraimites.