DS1 (8) has for a long time tried getting DS2 (4) into trouble by telling him to do things, then coming to get me to show me what DS2 has done that is naughty. I have explained that isn't a kind thing to do, that he is as bad, worse, for telling DS2 to do it. He lies about any involvement, but his lying skills are very saddly lacking.
e.g. The other day DS2 made a potion after he was technically in bed, with all the shampoo, shower gel etc over the bathroom floor.
Anyhow, yesterday, on the way home from school, DS2 was on his bike. We have an alley next to our house. DS2 bombs down the alley (has a hill) and tends to wait at the bottom - as long as I have threatened him at the top! There is one house between ours and the bottom of the alley and I am paranoid our neighbour will reverse out his drive one day and hit him if he goes off the end of the alley. DS1 threw a massive fit - DS2 won't stop, he will get hurt etc. (He was already sulking as we had gone DS2s route home, rather than his). I was running down the hill behind DS2, with DS3 in tow. DS1 slightly ahead of us. I turned the corner on the alley way about 5ft behind DS2, to see DS1 telling DS2 he mustn't wait at the end of the alley and to go straight to the house. Result DS2 nearly getting hit by DH who was about to drive onto our drive way.
Any tips to make DS1 realise that this just isn't acceptable behaviour.