The problem appears to be uncle had legal authority presumably at the time he did these things. That is not necessarily a criminal act. The prosecutor would need to prove he violated the fiduciary duty of the POA. It appears he is not willing to spend city funds pursuing it.
What is legal about taking advantage of two mentally incompetent elderly people?? Can any crooked attorney grant "legal authority" to commit Elder Abuse, Neglect, and Financial Exploitation??
I see the problem as the uncle hiring an attorney to prepare POA docs and a new Will, having two people who are CLEARLY mentally incompetent and under assisted living care for severe dementia sign these documents, using two young health care workers as witnesses (which as specified in the POA are not valid witnesses), clearing out a safety deposit box containing tens of thousands of dollars of jewelry, emptying my grandfathers banks accounts, paying the attorney exorbitant legal fees as well as "compensation" for himself, not paying ANY assisted living facility fees or prescription medication fees for months causing past due bills to exceed $20,000 and nearly having my grandparents evicted from the care facility for non-payment....
EVERY action that the uncle took once he had medical and financial POA was for personal gain. Not ONCE did he make ANY attempt to contact ANY health care worker regarding the current health status of my grandparents. If this isn't a textbook case of Financial Exploitation, I don't know what is...