FAMILY CODE SECTION 9340
9340. (a) Any person who has been adopted under this part may, upon
written notice to the adoptive parent, file a petition to terminate
the relationship of parent and child. The petition shall state the
name and address of the petitioner, the name and address of the
adoptive parent, the date and place of the adoption, and the
circumstances upon which the petition is based.
(b) If the adoptive parent consents in writing to the termination,
an order terminating the relationship of parent and child may be
issued by the court without further notice.
(c) If the adoptive parent does not consent in writing to the
termination, a written response shall be filed within 30 days of the
date of mailing of the notice, and the matter shall be set for
hearing. The court may require an investigation by the county
probation officer or the department.