I am co executor of will to my late mother's deceased estate with her grandson. Both he and I had power of attorney prior to her death but he had access to her accounts to pay and money due when she was placed into a nursing home. I have now found out that he spent approx $134,000 from her estate on himself for overseas trips, buying a unit, etc, etc. He has been sent a renunciation letter but is not responding! What is our recourse next?