Yes a Parent Visa UK can be extended. However, to be eligible to extend your visa your child must either:
Be under 18 on the date you apply.
Have been under 18 when you were first granted leave under the Parent Visa and are not living an independent life.
Your child would be seen to be living an independent life if, for example, they’ve left home, got married and had children.
Your child must be living in the UK and one of the following must also be true:
They’re a British or Irish citizen;
They’ve settled in the UK - for example, they have indefinite leave to remain, settled status or proof of permanent residence;
They’re from the EU, Switzerland, Norway, Iceland or Liechtenstein and have pre-settled status - they must have started living in the UK before 1 January 2021; or
If you’re applying in the UK, they must have lived in the UK for 7 years continuously and it would not be reasonable for them to leave.
You will usually need to have sole or shared parental responsibility for your child. If you share parental responsibility, then it is important to note that the child’s other parent must not be your partner, and you must be able to prove that you’re playing an active role in their upbringing (and will continue to do so). They must also either:
Be a British or Irish citizen;
Have settled in the UK - for example, they have indefinite leave to remain, settled status or proof of permanent residence;
Be from the EU, Switzerland, Norway, Iceland or Liechtenstein and have pre-settled status - they must have started living in the UK before 1 January 2021.
If the child lives with their other parent or carer, you must show that you continue to have access to the child in person, as agreed with the other parent or carer or by a court order.
Other requirements are:
Proof that you can meet the English language requirements;
You can continue to support yourself financially without claiming public funds;
You have suitable accommodation.
You must also continue to be of good character.
Exceptionally, some of these requirements can be waived, depending on your circumstances.