https://www.polarisparentingproject.com/state-articles/modifying-a-parenting-plan-in-california 2026-05-02 https://www.polarisparentingproject.com/state-articles/the-custody-process-in-california 2026-05-02 https://www.polarisparentingproject.com/state-articles/how-parenting-plans-take-shape-in-california 2026-05-02 https://www.polarisparentingproject.com/state-articles/how-custody-decisions-are-made-in-california 2026-05-02