Based on the father's visitation that you have provides, he does not have visitation on Sundays and since the mother
is the custodial parent
, it would typically be assumed that she would retain custody on the days not set aside for the father. So the father does not appear to be acting inconsistent with the court's order of visitation by not taking custody of the children on Sundays.
However, since the parents' work schedules have changed since the custody arrangement was entered, they could seek a modification of the order and the mother could also seek an increase in child support
if she is having to incur additional child care expenses due to the change in schedule.
It is usually best to first try to come to a mutual agreement without involving the court, either through an attorney or mediator. Then a stipulation could be filed with the court indicating that the parties have agreed on a new custody/support arrangement. If this has been tried unsuccessfully, then a motion to modify the order of support and custody could be filed with the court wherein the court will decide the issues based on the best interests of the children and the state child support guidelines
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