If the power of attorney is signed by witnesses, as provided in Section 4121, the following requirements shall be satisfied:
(a) The witnesses shall be adults.
(b) The attorney-in-fact may not act as a witness.
(c) Each witness signing the power of attorney shall witness either the signing of the instrument by the principal or the principal’s acknowledgment of the signature or the power of attorney.
(Amended by Stats. 1999, Ch. 658, Sec. 30. Effective January 1, 2000. Operative July 1, 2000, by Sec. 43 of Ch. 658.)