I thought this was a great article on the impact of special-needs children on “mainstream” siblings. The article discusses what I have found in my counseling practice – siblings of special-needs kids tend to be more mature, more keenly aware of injustice, and have conflicting emotions about their sibling. Giving sibs an opportunity to talk with other sibs helps normalize their experience.
http://www.time.com/time/health/article/0,8599,1698128,00.html?cnn=yes