How much may a trustee charge for their services, and when?

Question Details:

I am the trustee for my brother's account. He is dying of cancer and has ceased treatment. The amount of the account is approximately $200,000 and the cancer is melanoma. At this rate the trust will be left with about $100,000 - $150,000. I have never charged a fee for trustee services. Upon his death before the trust is transferred to his son I would like to charge a fee. May I do this and how much may I charge? Important Notice