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You would need to get them to give evidence in court. To do this you would need to apply to the court for a Re W hearing. To assist I have attached a link to Re E which is a more recent court decision but explains the process for a Re W hearing. https://www.familylaw.co.uk/news_and_comment/re-e-a-child-2016-ewca-civ-473#.WocIfyOcY3g