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When your family members can apply later
If you start a new relationship when you have a valid BNO visa, your partner can apply as your dependant.
They’ll need to use your application number in their application to link them together.
If your child (under 18) was born after you got your BNO visa, you can apply for a BNO visa for them. You must have a valid BNO visa when you make their application.
https://www.gov.uk/british-national-overseas-bno-visa/your-family-members#:~:text=If%20you%20start%20a%20new,a%20BNO%20visa%20for%20them