The children
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 Nebo
Nbow (neb-o')
Nebo, the name of a Babylonian deity, also of a mountain in Moab, and of a place in Palestine -- Nebo.
fifty
chamishshiym (kham-ish-sheem')
fifty -- fifty.
and two
shnayim (shen-ah'-yim)
two; also (as ordinal) twofold -- both, couple, double, second, twain, + twelfth, + twelve, + twenty (sixscore) thousand, twice, two.