DS1 is "self employed" doing a paper round of a free paper.
During the Easter holidays, DS2 (nearly 12 yo) wants to do the paper round for fun. DS1 has no objection to this - he gets the money in his bank account, and gets to lounge around doing nothing. - He if was feeling generous he might give DS2 the money, but we haven't got that far as DS2 is happy to do it for free.
DS2 gets to walk around suburbia posting papers, which he seems to really enjoy (he helped DH do it once when DS1 was ill)
So basically my question is, is working, voluntarily for no monetary reward illegal? Is it classed as slavery? 