Kim - I am sure E is not the first or only "only child" in their facility. Everett has a baby brother and definately has his fair share of discipline issues. I have to say that E has the advantage at home because there are 2 of you and only one of him, but I can't imagine they will "blame" you. If they do, then it's not the right place for him to be.
The boys had an AWESOME playdate, we went to a park we've never been to then walked to dairy queen. The kids had a great time, even Dalton! This is going to be a fun summer!
I don't think being an only child has anything to do with it either. Russ def had his share of issues, and still does. I agree with Amy if they try blaming you instead of coming up with a plan of action to help E then its not the place for him.