California Code, Probate Code - PROB § 19022

(a) A proceeding under this chapter is commenced by filing a verified petition stating facts showing that the petition is authorized under this chapter and the grounds of the petition.

(b) The petition shall set forth a description of the trust and the names of creditors with respect to which action is requested and a description of each claim, together with the requested determination by the court with respect to the claims, provided, however, that this section does not require the filing of a copy of the trust or disclosure of the beneficial interests of the trust. That petition shall also set forth the beneficiaries of the trust, those claimants whose interest in the trust may be affected by the petition, and the trustees of any other trust to which an allocation of liability may be approved by the court pursuant to the petition.

(c) The clerk shall set the matter for hearing.