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Answer: Ask your sister why she is going to sell the house. I would guess it's to help pay for your Dad's care. If not, try to persuade her not to sell. If that doesn't work, you can go to court to stop her. One of the ways would be to obtain guardianship (conservatorship in some states) of your father.
Unfortunately, a will is utterly meaningless until a person dies. It does show intent, but if your father needs money from the sale of the home for his care, that takes priority.
There may be a way around selling, however. Your sister should talk with a certified elder law attorney about alternatives. You can find such attorneys through this website: www.naela.org
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Jane Doe Deer