What should be done to settle a relative's estate?

My bachelor uncle passed away a few months ago. In going through his papers, I found his will made out in 1986. In it, he named his two sisters as co-executors and beneficiaries.One of them passed away in 2011. His other sister is incapacitated with Alzheimer's. She is not capable of acting as executor or signing any waivers and I do not know if she has a POA. I am not mentioned in the will. My father, who passed away in 1983, was my uncle's older brother. A successor executor was named in the will. After an exhaustive search, I managed to locate him. In a phone conversation with him, he indicated that he was no longer interested in acting as the executor. My uncle's is a small estate. His only asset is a bank account with less than $20,000 in it. I did call the county Surrogate's Court and explained the situation. The person I spoke to said it was "complicated" and should seek the advice of an attorney. I am not sure what I should do next.