Yes, there is no direct RPT flight. As they are young, they would have to travel as unaccompanied minor, requiring a responsible adult to check them in and one to collect them. This would require me flying to YSSY with them and putting them on regional flight for their mother to collect them at the destination. Costs to do this option equal or exceed the costs of flying them to the midway point myself, and get their mother out of a 10hr drive at no cost to her. She wont assist in cost of flying them except to give me what it would cost her in fuel, $150 !