The co-trustee has rights and obligations equal to the other trustee.  This includes not only an accounting - an accounting is now due to all of the beneficiaries and not just the trustees - but all the trust administration procedures.  The trust document should state whether co-trustees must act jointly or can act independently.  If it does not state this, California trust law will say how co-trustees must act.Both trustees are required to carry out the intentions of the trustor, not their own intentions.  Neither trustee may take actions that benefit them while harming other beneficiaries.  If the trustee who lives in the house does not share information and responsibility with you, he or she can be removed by a court.If the trustee does not cooperate fully, you should consult a trust lawyer nearby to assist with this.