Who can diapute the attorney's bill? We, his parents, hired the attorney on behalf of our son so we, his parents, are paying the bill.

Even though my son is technically the client, are we within our rights to question and possibly dispute some of the charges on the bill? There are approximately 10 hours @ $300 that are just generally stated as "emails, phone calls. Memo, letters, review file, work on file", etc., that I feel are too vague to pay at that rate. I am wanting to request more detailed explanations and copies of the emails, letters, and memos, and explanations of the review file and work on file and how it benefited my son's case. My son is aware of what I'm doing and has authorized it and sent a release. So, I just need to know if, as the payer of the bill, do we have the right to request this information? I mean we are talking approximately $3000 worth of charges that I believe need to be substantiated in a little more detail.