California Probate Code Section 4235

If the principal becomes wholly or partially incapacitated, or if there is a question concerning the capacity of the principal to give instructions to and supervise the attorney-in-fact, the attorney-in-fact may consult with a person previously designated by the principal for this purpose, and may also consult with and obtain information needed to carry out the attorney-in-fact`s duties from the principal`s spouse, physician, attorney, accountant, a member of the principal`s family, or other person, business entity, or government agency with respect to matters to be undertaken on the principal`s behalf and affecting the principal`s personal affairs, welfare, family, property, and business interests. A person from whom information is requested shall disclose relevant information to the attorney-in-fact. Disclosure under this section is not a waiver of any privilege that may apply to the information disclosed.