Ok, thanks very much for clearing this up!

Thanks for the information.
Would it be form MN1 for this?

Thank you

Hello, My wife and I both have British Citizenship (I from birth, my wife since 2016). She has a son from a previous marriage who is 13 years old and has indefinite leave to remain, having lived in the UK following a court appeal with HMRC in 2017. We would like to apply for British Citizenship for ...