I just wanted to make sure that everyone has heard of the Sibling Support Project. The Sibling Support Project is a national effort dedicated to the life-long concerns of brothers and sisters of people who have special health, developmental, or mental health concerns.
A search of the Sibshop directory turns up local sibshops in Allegheny, Chester, Cumberland, Bucks, Delaware, Lancaster, Lackawanna, Monroe, Montgomery, Philadelphia, and Westmoreland counties.