Also did not have power of attorney. He has dementia She also did not have authorized guardianship. She was able to gain acess to his life saving by him putting her name and another sibling name on his bank account because he relocated to live with them for help and care. He stayed for approximately two months and came back to state of origin and they kept his money and did not transfer it back to him. The amount was close to 150k in money and other assets that they use for trips, shopping sprees, and opening business to profit for themselves. I am currently the only sibling that lives in the area to assist my father, and have been since 2007. He went to stay with siblings in question in 2013 of June, and was sent back to me in 2013 of August.
Upon his return, he asked me to assist him in getting his money back from the siblings, but because these specific two siblings are estranged from the other five siblings, and he had their name on his banking accounts, and at the time no one had a valid POA or Guardianship, our hands were tied. My dad suffered mental when he couldn't get his money back and had to be placed in a nursing home a few weeks after returning. Is there anyway I can sue them to recoup my dad's life savings?