United Kingdom - Passport & Nationality - British Citizenship by Registration - Minor
A minor can obtain British citizenship through the process of Registration at the same time as one or both of their parents are applying for Naturalisation as a British Citizen.
For clarity, the criteria are:
- A minor (under the age of 18);
- One (or both) parent(s) become eligible for Naturalisation.
Please note; this is strictly speaking at the discretion of the Secretary of State, though it is almost always granted.