Father of 11 year old son, has denied me access and has not kept up on weekon /week off arrangement. This happened 3 weeks ago, missed out on his birthday, Easter and School Holidays. His grounds for withholding access to my son is his demanding me to pay for Sporting commitments that he organised was not met. We have always had the arrangement I cover my sons Private Health and Schooling which I've always done, he was to cover sports. I simply don't have the extra funds to cover sports also. So he decided to keep 11year old. He has just told me he is letting Centrelink know that my son is living with him full-time so he gets full payment. Does he have the authority to make this change when it's not an arrangement I've agreed to?