Can trustee allow her adult children to live in father’s house rent free?

My father’s second wife passed away in March 2016, at which time my sister immediately had her children, ages 20 and 22 move into one of his houses under the stipulation they were to check on my father every day and pay the cable bill. They have done neither. My father pays their bills unknowingly, and my sister, as trustee, won’t give my father a copy of his will and trust so he can see what he signed. With the exception of my brother and I, the rest of the family constantly lie to my father about issues concerning his health, driving, and legal issues. Due to his early stage dementia, this causes more confusion for him. My sister (trustee) has stated a couple of times that she wished our dad would die. Doesn’t that constitute elder abuse? (Glenshaw, PA)
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