Family analysis: In The Mother v the Father, the mother was granted permission to appeal an earlier failed application to re-open a fact-finding determination made in private law children proceedings in which the judge had made findings of parental alienation against the mother. While an earlier application for permission to appeal the original fact-finding judgment had been dismissed on the basis that it was totally without merit, the court granted permission to appeal on the sole basis that the need for the court to look at the practice of instructing unregulated experts in such cases provided a compelling reason, under Family Procedure Rules 2010 (FPR 2010), SI 2010/2955, r 30.3(7), for an appeal to be heard. The appeal was dismissed but criticism was made of the approach taken by the Association of Clinical Psychologists (the ACP), which had been given permission to intervene in the appeal proceedings. The father, who succeeded in opposing the appeal and who was the recipient of a costs order in his favour, brought the present application for an order for his costs of the appeal to be paid by the appellant mother and, if not, then, either in whole or in part, by the ACP. The expert, Ms Gill, whose instruction was at the centre of the appeal, appeared as an intervenor in the appeal and also applied for an order for costs against the appellant mother and/or the ACP. The appeal was heard by the President of the Family Division, Sir Andrew McFarlane. Written by Poonam Bhari, barrister at 3PB Chambers.