Mother awarded custody of children of 3-year-old with access by the father but doesn't allow access. The child is 7 when, due to mother's ongoing mental health problems, she sends the child to live with father and stepmother, stating that she can't provide a stable life for the child. There was no change in custodial arrangements due to threats by the mother to remove the child if any legal action is suggested. Two years on, mother wants the child back but the child, now 9, doesn't want to go as she's settled and doesn't want to return to itinerant lifestyle with 'angry mum' (mum has bipolar). Where does father stand under family law?