Cal. Prob. Code § 6348

Until distribution of the property pursuant to an order for distribution is completed, the court in which administration of the estate of the testator is pending has exclusive jurisdiction over all proceedings and matters concerning undistributed property, including, but not limited to, the appointment, declination, resignation, removal, bonding, and compensation of, and the delivery or transfer of the undistributed property to, a custodian. After distribution of any property is completed, the court has no further jurisdiction over the distributed property and the property shall be held subject to the California Uniform Transfers to Minors Act.