i have just been given power of attorney over my father , his grandson is 45 and been living with my father rent free bill free all his life, my father has been in a home for over a year and the grandson has been using my fathers bank card, there is a police investigation due to over 10 thousand pound being stolen from my fathers account the outcome of this investigation is near , but my question is , i have asked the grandson for the spare set of keys for the house as i need access to the house paper work ect but he has refused to hand the keys over to me , i want to do this the correct way , what can i do ?