California Code, Probate Code - PROB § 5660

(a) If a revocable transfer on death deed recorded on or before 60 days after the date it was acknowledged before a notary public and another instrument both purport to dispose of the same property:

(b) A claim that a revocable transfer on death deed is inoperative pursuant to this section shall be brought as a contest under Chapter 5 (commencing with Section 5690).