I have heard of someone who hired a niece as a live-in caregiver and I've heard from others that close relatives are often refused.
It is on you to show that your live-in caregiver meets the requirements with paid work experience as a live-in caregiver or a 6 month caregiver course and that your job offer is genuine and that you truly will be hiring the person to work for you, providing for her like any other employee and paying her a fair wage.