Section 6208 Of Article 1. Definitions And Rules Of Construction From California Probate Code >> Division 6. >> Part 1. >> Chapter 6. >> Article 1.

. (a) If a California statutory will states that a person shall perform an act, the person is required to perform that act.
  (b) If a California statutory will states that a person may do an act, the person's decision to do or not to do the act shall be made in the exercise of the person's fiduciary powers.