Here's the most important thing - those we didn't think we would ever hear from again often contact us later, with good memories, and good feelings we didn't know existed.
Dr. Glasser always talked about "What's the value you're protecting". This is often the reason some children don't bond - they are afraid they will hurt their biological family if they make a relationship with us. Later, they use the things we taught them, and then remember us and what we did for them.
We are often contacted through Facebook, sometimes during the holidays someone shows up with gifts for the group homes, saying, "It's time to give back". It's always such a pleasant surprise.