I think they should. They have to get used to working at home and working independently at some point, so it makes sense to gradually build that up from when they are young. Although, I personally never did any of the homework I was set, but as soon as I got to college and then Uni of course I would because it was actually important. But I do think you should really, it gives kids an early start on learning to manage their time too for when they get older and it gets much more important.