Keep being proactive and calm and get to know them. Maybe even take them to lunch together or invite them to your home for lunch. Sounds like there may be emotional barriers that have nothing to do with you or your child. Trust your instincts. The more you know, the calmer you remain, the more they will trust you and one another.

The key thing, I do is to listen to both sides, and used what ever I see that is beneficial to my child.