California Code, Probate Code - PROB § 4545

(a) The attorney-in-fact, if the court determines that the proceeding was commenced without any reasonable cause.

(b) The person commencing the proceeding, if the court determines that the attorney-in-fact has clearly violated the fiduciary duties under the power of attorney or has failed without any reasonable cause or justification to submit accounts or report acts to the principal or conservator of the estate or of the person, as the case may be, after written request from the principal or conservator.