Sounds like a variation on what i get .... but it is one-sided in my house. DD#1 bangs on about how much she hates her little sister and how we should never have had more kids and DD#2 is always ruining her stuff blah blah ... while DD#2 is very very upset that she just wants to play with her big sister and she wikes her and DD#1 is being mean and stupid

Need to fatten the baby up some more, teach him to crawl and walk and talk and hopefully big sister won't seem so interesting when there is a little brother to play with. The solution here found itself but won't work for you - DD#1 just spends lots of time visiting her friends, in a comfortable little sister free zone, and we stay home with the little one in screamless, argument-free bliss.