<human>: Could you distill the essence of the text into 1-3 sentences?

Okay so, back in September my grandfather had a really nasty fall in the street. He cracked his skull and had various other injuries. He temporarily went to a nursing home and they basically helped him learn how to walk again. Currently my grandfather is back at home, but is stuck in bed most of the time. Naturally my mother and I take care of him, as our family is pretty shady and doesn't seem to give a damn.

He mentioned to us recently that he was $150 short on rent and he didn't know why. We're used to him forgetting things now, as he does it frequently. So I looked into it for him. We called up the bank and were informed that there were various transactions to Verizon and calls to an inmate facility. The card was canceled and he will be receiving a new one shortly. 

However, considering the transactions, my mother and I believe that my cousin (she's 21) has been using my grandfather's card without his permission. We didn't make this assumption out of the blue. She has a serious history of stealing from family and many other people, as well as a history of drug use. Her phone is a Verizon plan and she is the only one who has anyone in jail that she would be calling. The number used for the phone charges was even her phone number. My grandfather refuses to do anything about this, as he doesn't want to get her in trouble, but if he lets this go away without doing anything it's going to happen again. I don't know what to do to get him to see that she isn't this perfect angel and something needs to be done about this otherwise he is just going to continue to lose money. I am so disgusted by my cousin's behavior and I really just don't know what to do at this point. Any advice is much appreciated.
<bot>: My mom and I discovered transactions on my grandfather's account that relate back to my cousin and he refuses to get her in trouble, but it will happen again if nothing gets done. Please help.