CA Prob Code Section 19011

(a)

The Judicial Council may prescribe the form and contents of the petition, notice, claim form, and allowance or rejection form to be used pursuant to this part. The allowance or rejection form may be part of the claim form.

(b)

Any claim form adopted by the Judicial Council shall inform the creditor that the claim must be filed with the court and a copy mailed or delivered to the trustee. The claim form shall include a proof of mailing or delivery of a copy of the claim to the trustee, which may be completed by the claimant.