My son has been separated from his wife for 4 years. To date they have agreed to split the caring of their two children (aged 14 an 11) 50/50 and this has worked. There are no court child custody orders in place. Recently she has moved location and threatened to have the children 100% of the time. He and the children wish the current situation of 50/50 to remain. He does not want to go to court at this stage. What action can he take? And can she have the children 100% without a court order?