Reovering assets from an estate

[eggman68]

I am the executor of my mother's estate in New York. She had two bank accounts while she was alive. One of them was a standard checking account that started out with $22,000.00 and ended up with only $2000.00 when she passed. The other was money she received from a life insurance policy which had $80,000.00 in it. My step sister some how convinced my mother to write a check to her for the $80,000.00 before my mother passed. My mother was an alcoholic, suffered from severe depression and showed signs of suicide and I feel that she was manipulated into doing this when she was not in her right state of mind. There are three blood siblings named in her will who are very angry to the fact that this money has been bypassed from her estate. Is there any way that I can try to recover this money from the evil step sister?

Thank you, for your time.What is the name of your state (only U.S. law)?What is the name of your state (only U.S. law)?