Payment Settings

Hello,
So I’m verifying my PPH account and I’ve come to the payment settings. There it asks me to put a "Utility Bill: Gas/Electric/Landline Phone/Water Bills/Council Tax OR Paper copy only of Credit Card/Bank Statement" (I've already put my ID there). Here is the problem. I live with my parents and the bills are on their name, so I do not pay bills with my card, I only contribute with cash with them in paying bills. What document can I photograph, or scan, and send it instead of these documents?
Thanks!