Chapter 3. Permanent And Stable Home of California Probate Code >> Division 4. >> Part 2. >> Chapter 3.

(a) The Legislature finds and declares that it is in the best interests of children to be raised in a permanent, safe, stable, and loving environment.
  (b) Unwarranted petitions, applications, or motions other than discovery motions after the guardianship has been established create an environment that can be harmful to children and are inconsistent with the goals of permanency, safety, and stability.

If a person files a petition for visitation, termination of the guardianship, or instruction to the guardian that is unmeritorious, or intended to harass or annoy the guardian, and the person has previously filed pleadings in the guardianship proceedings that were unmeritorious, or intended to harass or annoy the guardian, this petition shall be grounds for the court to determine that the person is a vexatious litigant for the purposes of Title 3a (commencing with Section 391) of Part 2 of the Code of Civil Procedure. For these purposes, the term "new litigation" shall include petitions for visitation, termination of the guardianship, or instruction to the guardian.