In proceedings for a child arrangements order, the whereabouts of both the parent with care of the child and the child are unknown. The parent with care is not co-operating with the Children and Family Court Advisory and Support Service (Cafcass) for the preparation of a report ordered by the court under section 7 of the Children Act 1989. What action can be taken to ensure that the parent co-operates in being interviewed, and for the child to be seen, by Cafcass?