Oh and side note about 'parents' rights' and 'parent alienation'. Remember, it is HIS responsibility to facilitate his time with his children.
I remember when my son's bio-dad and his girlfriend tried to tell the judge that I was keeping our son away from him and that I used breastfeeding as a secret ploy to retain 100% time, visitation, and custody. When I gladly produced receipts to the judge for the pump, bottles, cooler, liners, etc., the judge called BS on their theory.
So, please do document EVERYthing. It works.