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Thank you for the replies, my daughter is going to ask the father, hoping that he might agree as it's what the child wants, (the father has had the same problem, taking on his stepdads name but not changing through deed poll) so hoping he might see sense. If he does not agree she will be known as the same as the rest of the family, (there are already younger siblings) and once she reaches an age to do through deed poll it will be her desision again if she chooses to make it official.