In fairness it does seem a little strange. Your son should still be supervised at this age i should think but more of an effort should be made to encourage him to start doing as much as he can for himself. I agree it could just be a convenience thing or a little more hands on then what may be required but you don't mention whether you're concerned for his intellectual development or if you think it's just inappropriate. Or both. What does your wife say? Are you asking for advice on how to broach the subject or would you like to discuss how to progress from here if conversing/arguing hasn't worked out? I hope you feel you can elaborate further. Either way good luck.