Don't think it a good idea feeding them eggs. I bought organic feed and my recused hens turned up their beaks. I feed them all sorts: rice, chopped up and cooked spuds, carrots, greens, any veg reduced from shops, even our organic bread left over. A bit of mealworms as well. If you can, let them out in the garden where they will dig for worms. When I was working on my raised bed, they stayed close and one opportunist ate about 30 fat juicy worms. When I was fed up with them digging holes in my garden (I love my plants more than anything else in the world), I fenced off the raised bed and they hopped on the raised dwarf walls and started eating my salvias. So you see, you can research and grow some herbs for them as some are very good for them. They also ate my fennel leaves. It's a good way to introduce your son to grow more vegs.