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My Thai step daughter has lived with her mother and I in England for the last 4 years. she is 16. I would like to apply for her british Citizenshio. her mother became a British citizen 2 years ago. her natural father is on the birth certificate but has never been present in her life. I am unsure which part of the application form to complete and whether when she turns 18 she would then have to apply again? I am a British citizen