I am POA for a family friend who is estranged from his son, the gentleman passed away. I have had car on property, can i charge storage fees

I am POA and HCP for a family friend, who is estranged from his son. They both owned the car that I was keeping safe on my property. The gentleman and I offered him to buy out his half and give his dad the money for long term facility care, of course no response. The gentleman died a week ago, can I charge the son storage fees for keeping the car at my house and already offered him to buy out his half. The son is not a nice person and i live in MA