Cal. Rev. & Tax. Code § 62.3
(a) Notwithstanding any other provision in this chapter, a change in ownership shall not include a transfer of a cotenancy interest in real property from one cotenant to the other that takes effect upon the death of the transferor cotenant if all of the following conditions apply:
(b) A transfer of cotenancy interest in real property from one cotenant to the other shall take effect upon the death of the transferor cotenant under any of the following circumstances:
(d) For purposes of this section, both of the following apply: