Oh he is doing soooo well! Wonderful! You are such a good teacher mummy
The teaching videos on the softmozart website are great for correcting fingers and just seeing different interpretations. I have used them when I get stuck tripping over fingers in a piece. Personally I don't really care what fingers I or my kids use so long as it makes sense in toms of flow and they can play the piece.
Also if you do ACTUALLY PRACTICE the fingering techniques on the softmozart website you will start to automatically use the correct fingers as you play.