Yes your right I forgot he was not born in the Uk. I have found somewhere online with a advice line. It’s worth checking I suppose.I think a secondary issue is that he won’t necessarily have British citizenship. He’ll be eligible for it but because he was born abroad unless she’s applied for it, he won’t have it and from all her rants about how she doesn’t want the British authorities to know where she and he are, I wouldn’t be surprised if she hasn’t. Quite what passport he has is another question…
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Not sure if I can share it on here but Google Children and families across borders. Really interesting page