I will second *Good Friends are Hard to Find* as being a great resource, more for parents though.
I think the challenge on your street is the number 3. Three children can be a tough dynamic because one child often gets left out. As a child, I frequently played with two sisters at their home and I was usually the one who was left out. I've seen this happen with my older DD when there are 2 other girls, especially if the other two girls know each other well. I try to avoid having 3 on a playdate if possible. Is there another boy on the next block that is close enough to change the dynamic?
Good luck!
