At the moment neither parent will have Residency unless they have been to Court so Dad could stop Mum moving, at least temporarily until there has been a full hearing. As I understood it, the Courts were getting much tougher about Mothers whisking the children off, and so they should. The children aren't yet at an age where they can give informed consent as to their living arrangements and the absolutely best scenario for children is where the parents can sensibly agree to continue co-parenting. I believe that the Courts are looking to of a more 50/50 arrangement wherever possible so that is their starting point. Moving children so far away would thwart that because they could not stay with the non resident parent during the week because of schooling. Our solicitor told my Son that he should not have let his GF take their child back to her mother's over 200 miles away because the child had a right to both parents. When I pointed out his GF only had us in the area so wanted to go back to her parents, the solicitor told us that there was nothing to stop her from doing that but she would have to leave the child with him. As we had already facilitated her move back we had inadvertently given her permission which we could have kicked ourselves for. I do so wish we'd got legal advice first because it would have saved my son a 450 mile round trip once a month and he could have been much closer to his child, assisting in schooling decisions, medical treatment, etc. However, as he lives so far away, his views are mainly discounted.