My ex and I have a verbal agreement regarding custody of children and access with our two children, now our son has started school. She is finding things a bit too much for her to handle, despite living with her parents. We live 5 hours apart at the moment and she recently subtly suggested myself and my new partner move closer so we can help out more with transport since she doesn't have a drivers licence and her father works full time. She has just started influencing our son that the distance is too far to travel, despite the fact we have had this agreement in place for over a year and the access currently is only half the school holidays and phone calls 3-4 times a week. Where do I stand legally under family law?