If you are outside the UK - you can apply for a family visa to live with your spouse or partner, fiancé, proposed civil partner, child, parent, relative who will provide you with long term care for you. Check if you need a Standard Visitor visa or Marriage Visitor Visa. If you are in the UK - you can apply to extend your stay with your family member if you are already in the UK on a family visa. If you come to the UK on a different visa, you might be able to switch to a family visa to stay with your spouse or partner, child, parent. You may be able to apply to stay in the UK on the basis of your private life if you have lived in the UK for many years already. If you do not meet the rules to enter or remain in the UK because of Coronavirus (Covid-19), you might still be able to apply to extend your stay or switch to a family visa. You can extend or switch at any time before your current permission to stay in the UK expires. You must live in the UK for a certain period of time before you can qualify for settlement - indefinite leave to remain.
Cost of joining your partner, parent or child in the UK £1,523. Cost for an application for leave to remain with your family is £1,033. Cost for an adult who needs to be looked after by a relative in the UK is £3,250.