DS1 (three next month) has always been jealous of DS2 (15 months), but since DS2 started walking two months ago it's got a lot worse, with DS1 screaming or hitting every time DS2 touches anything (whether it's his or not), or comes near me. DS2 has quickly wised up to the fact that it's better to attack than wait to be attacked, so he goes in for pre-emptive strikes even when his brother is leaving him alone, so DS1 gets bitten, scratched and hit a lot. I keep telling myself this is just a phase they're going through, and they'll eventually learn to get on, but I was wondering if there is anything I can do to help them get there a bit faster. At the moment I feel like a UN peacekeeper and not a particularly effective one at that!