will taking a polygraph before court help my case against someone who lies. can i then ask that person to take one too ?

I gave someone and his wife power of attorney. he was stripping me of my possessions and money. he has been buying and self medicating with vicodin since before 2012 that I know of. I think he has become a junky. two years ago he began treating me really bad, ignoring his responsibilities of power of attorney. I finally had enough of his nonsense and called adult protective services I in may of 2018. he decided he would keep five thousand dollars I had in his safe. he made a false 911 call while we were in a nasty argument, and tried to get me committed, saying I was off my meds. there are no meds. I have cancer and severe back and hip damage. I was depressed because my whole life stopped. I stopped taking antidepressants a while ago. I have never been violent or psychotic. actually. he has a bad problem with rage. I am sure he did not tell his wife and a mutual friend about the five thousand dollars. I don't think he told her she was named with him on the POA paperwork either.