I think - and please, someone else correct if they think or know otherwise - that this should be just fine. You provide what you can, and I'm under the impression (again, please correct) that this side will only be considered if your application is falling back on an ECHR §8 (right to family life).
Yes, that’s correct - as I understand it, they will only look at the British child’s documents if the financial requirement is not met and the application falls for refusal.
In that case, they will consider the application under Article 8: Right to Family Life and it will only be approved under the 10-year route if there is a British citizen child living in the UK and for whom there will be unjustifiably harsh consequences if their parent is forced to leave the UK due to a visa refusal.
It used to be that you only needed the child’s birth certificate for the application, but about a year ago, they added the passport and the letter showing the child’s address to the required documents.
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