Can a family member be removed from trust account after grandmother passes away?

My grandmother assigned a family member to help oversee her finances since she was elderly and needed daily assistance. However, the family member refused to help my grandmother once they received access to the account. They have have not helped her in over a year and they are the only person who can access the funds. My grandmother started to take legal action towards them this past year. Unfortunately, she recently passed away on February 16, 2020 at the age of 94 and she never got a chance to retrieve her funds. I now have all of her belongings as well as supporting documents that are related to this situation. Now that she is no longer here, my goal is to help fulfill her last dying wish of removing the family member from the family trust account.