My sister lies constantly about me- I'm not sure she can help it, or is even conscious of it. She imagines me as someone no one recognizes! Seriously, she projects such "evil" things about me I'd like her to get help. But she is the apple of my (now Alzheimer) father's eye. And her husband goes along because there is an estate at stake- I remember her as an early adolescent proclaiming my naïveté in associating truth and reality (in association with what I cannot remember). Problem- for me, she sells me as the devil himself- she is religious, I am not. What do I do to expose her?

Expose her? You do nothing. Your friends won't believe her. Your enemies will, and there's nothing you can do about that. If your father has Alzheimers he probably doesn't even understand what she's saying.

How does an estate figure into this?

JudyKayTee took the words right out of my fingers. To whom would you "expose" her? You need to avoid spending a lot of time with her since it's so painful for you, but be cordial at family events as best you can. Don't discuss private things with her as you know she'll be likely to use the information against you.

Is it actually likely that your father has cut you out of his will? If so, there's not much you can do except contest it after the fact, which means that right now you should be gathering evidence of your sister's special dislike for you. If there are caretakers (you say he has Alzheimer's, so I'm guessing there must be someone handling his business affairs) you might want to talk to that person and feel out the lay of the land. If he's been formally diagnosed, then the court would not consider him competent to make major changes in his will at this point.

Assuming he was on top of things prior to becoming ill, someone should have his Power of Attorney for specific purposes like bill paying, his Healthcare Proxy, and his Durable Power of Attorney. Who is that? Is it someone you can talk to in confidence? Who has been named executor of the will? If the answer to all of those questions is that it's your sister, then you might have a battle on your hands after Dad passes on.

Well, she's just taken sibling rivalry to a new level. That's it.

I don't think you can do much to bust her. Just be yourself. Those who truly know you won't believe whatever lies she tell about you.