Cal. Probate Code - PROB § 3110. Section 3110.
(a)
A proceeding under this chapter shall be brought by a petition filed in the superior court.
(b)
The proper county for commencement of the proceeding is the county in which a conservatorship proceeding of one of the spouses is pending. If a conservatorship proceeding is not pending, then in either of the following:
(1)
The county in which one or both of the spouses resides.
(2)
Any other county as may be in the best interests of the spouses.
