California Code, Family Code - FAM § 3150

(a) If the court determines that it would be in the best interest of the minor child, the court may appoint private counsel to represent the interests of the child in a custody or visitation proceeding, provided that the court and counsel comply with the requirements set forth in Rules 5.240, 5.241, and 5.242 of the California Rules of Court.

(b) Upon entering an appearance on behalf of a child pursuant to this chapter, counsel shall continue to represent that child unless relieved by the court upon the substitution of other counsel by the court or for cause.