DS1 (3.1) barely tolerated DS2's presence for the first 8 months or so, but now DS2 (nearly 1) crawls and cruises, DS1 just can't stand him. DS2 is forever after DS1's stuff and DS1 is getting increasingly angry and aggressive towards him. All I hear all day is "NO, DS2!", DS1 moves things that DS2 is standing up holding onto, etc. :( Should I just separate them physically and just accept that they won't get on at the moment? Or are there things I could get DS1 to do with DS2 so he appreciates having a little brother in some way? I can't just keep them in different rooms as then I won't be with DS1 enough. We're doing lots of nice things with DS1 when DS2 is asleep or at the weekends so I don't think it's just attention seeking.