My mother is 97 and has dementia. I have Durable Power of Attorney over her. Her will states the names of my brother, two grandchildren, and myself. The two grandchildren are the only ones listed in the will. She has numerous grandchildren and left them off the will. This has caused dissention amongst the other grandchildren not listed in the will. Is it possible as Durable Power of Attorney to have the two grandchildren that are listed in the will be removed?