DS is three and I just found out today that his favorite kids from school, boy/girl twins, are moving away in a few months. It breaks my heart to think how crushed he will be when they leave. He sees them every day at school, we often go to the park with them after school, they live on our street and we often have weekend playdates. I don't plan on bringing it up until just a few weeks before they move. What, if anything, can I do to lessen the blow when they leave?