Terms for subject General containing three boys

English	Russian
a boy of three	трёхлетний мальчик
the boys withdrew to read the forbidden prints, three taking their turn at a time, whilst three more "played dog"	мальчики отправились читать запрещённые книжки, трое читали, а трое других стояли на стрёме
there are three boys in my family	нас трое братьев
three-year-old boy	трёхлетний мальчик