My ex husband and I signed a private custody agreement when we separated 7 years ago (we are both now re-married to new spouses). Over the years it has been increasingly difficult for me to enforce this arrangement in it’s original form as he seems to have less time to spend with his children. He has made a number of changes decreasing his time with them and there doesn’t seem to be anything I can do legally to make him stick to it. Or is there?