Your mother is under no obligation to include you in her will. Will contests are difficult to win. The most common grounds for challenging a will are that the person did not have capacity to make a will or that there was undue influence by a third party that changed the person's intentions. You will have to consult with a lawyer in the state where your mother lives when the time comes to present him or her with the facts and get an opinion whether a contest would be winnable. Possibly you and your mother can patch things up. Good luck.
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Two of the nastiest pieces of litigation I have ever been involved in were will contests. If your mother is determined to be of sound mind, then winning the will contest will be as easy as rolling a 1,000 ton rock up hill. As long as an individual has testamentary capacity, they may do pretty much anything they wish with their earthly possessions in a will. The even worse news is that many wills have an in terrorum clause, meaning that if anyone contests, then they will pay not only their own legal fees, but also the legal fees incurred by the estate to defend itself against the contest, and the challenger also loses any share they may have had in the will.
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Yes she may exclude you from her estate. Her assets are exactly that, hers, and she can leave them to your sister, to a charity, or someone she met on the bus so long as her will is prepared properly and she is competent to sign it you have no rights to her property. Assuming she is competent when the Will is signed you would have an extremely difficult time winning a challenge as there is likely a fairly significant documented hsitroy between you and she that would be used by any proponent of the will as justification for the exclusion should arguments of undue influence be made.
Very truly yours,
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