Hi. My partner has a 6 year old daughter. The mother of his daughter has remarried and is moving interstate. Can she take the daughter legally without an agreement in place? When she was 2 years old, they had a mediator written request that neither could live more then 100kms away, and then it was meant to be shared custody 50-50 when the daughter turned 3 this has never happened ( custody of children). We also have a private aggreement in place of child support every week now she wants weekly payments plus us to pay for full Private School fees. With the move, she is saying we would have her for holidays, but when it comes to Christmas, she expects to have her back and never share Christmas. What can we do to stop this? We also have a company and he works for me. If she was to legally go for child support, do we have to back pay previous years?