Review the trust documents. If they include a “certificate of independent review,” it may be difficult to replace the trustee under California law. This means that its creator consulted with an attorney before selecting his successor trustee, and the attorney counseled him regarding his choice and approved it.
Collect documentation to prove your position that the court should remove the existing trustee. You must have grounds to remove and replace the trustee. In California, these grounds include refusal or failure to perform the tasks associated with the job, bickering with co-trustees to the point where the behavior impedes settlement of the trust or a breach of fiduciary duty, meaning that the successor trustee committed some act that was detrimental to the trust or its beneficiaries.
Complete a petition asking the court to remove the successor trustee. California offers an extensive self-help website that provides these forms, and they are also available from other websites. Fill in the blanks, identifying your relationship to the trust, such as if you are a beneficiary, a co-trustee or have another interest in its administration. Explain why you think the court should remove the trustee and attach copies of the proof of wrongdoing you’ve gathered.
Serve a copy of your completed petition on everyone who has an interest in the trust. These include all beneficiaries, as well as the successor trustee and any co-trustees. The petition includes spaces for you to list the names and addresses of all these people. California law allows you to serve them by mail, but a disinterested party must be the one who actually deposits the petition in the mailbox or takes it to the post office.
Ask the person who mailed your petition to sign the second page, attesting that he placed copies in the mail to everyone you listed.
File your completed petition with the probate court in the California county where the creator filed his trust. The court will notify you if a hearing is required.