Wills and Probate

Question is: My parents had an attorney do a Joint Will back in 2014 and left me as POA of everything and my sister second. My mother put my father into a facility a year ago having dementia. In December of 2016 her brother died and left her the beneficiary of his retirement. She has siblings starting to hassle to some degree over the rest of the Estate. She asked me in February to retain a Will and Probate attorney which I did. At the same time she became terminally ill. My sister was caring for her and come to find out my mother redid her will leaving everything to my sister. My dad is still alive and wants to go home. He has no account, because the money was moved. Is the first will still valid or void? What grounds do I have if any?
Asked Mar 23, 2017

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