Now even more confused. Taken from
https://www.gov.uk/uk-family-visa/child
If you’re over 18
Your parent can include you in their application as a dependent, or you can apply separately yourself. You can only apply if you:
got permission to stay in the UK (‘leave to remain’) on a family visa when you were under 18
do not live an independent life
You’re living an independent life if, for example, you’ve left home, got married and had children.
If your parent cannot include you in their form and you’re in the UK, you may be eligible to apply for Private Life in the UK (10-year route).