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Thankyou DT. I'll consider classes for him - trouble is, it has to fit in round child care and my work (my work comes first due to the fact that I pay the bills round here). We've spent most of the day looking at all sorts of paintings (we did go looking for a display cabinet for my little collection, but ended up looking at paintings instead - I could see him churning things over in his mind). If I can find them, I'll post some pics of some of his artwork which were turned into postcards.
Owdhammer, funnily enough he mentioned painting again today. So I did say there's a bucket of paint in the garage, you can get on with the bedroom tomorrow. I also threatened to do some painting myself - that should be enough to make him get on with it.