Please could I have some advice? DS1, 2.6, is normally a lovely, gentle, considerate little boy. He genuinely seems to adore his brother, 9months. But whenever they are together he's very rough - sits on him, rolls on him (often with legs in the air, therefore kicking him too), grabs him round the neck etc etc. DS2 inevitably cries- and has lately begun to cry when DS1 comes near him. I have tried explaining I know he doesnt mean to hurt him etc, tried the naughty step etc after warnings, but 5 mins later he's doing it again. I don't want to stop him playing with his brother but I'm at my wits' end. Any advice?