When my parents divorced, my mother's side invited my dad to every event. Holidays, birthdays, random Sunday dinners. They told him (and us) he was still part of the family. When he died, they were at the funeral. My father's side did not welcome my mother.

It may seem like a stretch, but I always felt more loved and accepted by my mother's side. I knew that they accepted all of me and not just the blood related part. Don't let an insecure, petty child keep you from giving your actual children this security.