Probate Code § 1810
ARTICLE 2. Order of Preference for Appointment of Conservator
If the proposed conservatee has sufficient capacity at the time to form an intelligent preference, the proposed conservatee may nominate a conservator in the petition or in a writing signed either before or after the petition is filed. The court shall appoint the nominee as conservator unless the court finds that the appointment of the nominee is not in the best interests of the proposed conservatee.