"Child labor" is, generally speaking, work for children that harms them or exploits them in some way (physically, mentally, morally, or by blocking access to education).
Children are only people who are 0-25 years old.
( z1 child :domain ( z2 person :mod ( z3 only ) :age ( z4 between :op ( z5 temporal-quantity :quant 0 :unit ( z6 year ) ) :op ( z7 temporal-quantity :quant 25 :unit ( z8 year ) ) ) ) )