There are certain circumstances in which a grandchild could object to a Will. Most likely the Will was probated without notice to you because you would not be entitled to any share of the estate if there were no Will. There fact that you were a caregiver by itself does not give you any rights to the estate. You need to take your questions to a probate lawyer and provide specific information about who the survivors are, when the Will was executed and whether you have any basis to beleive that the Will was not the product of your grandmother's own wishes.
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Attorney Brophy is correct. It is rare that a person would have standing to contest a grandparent's will, but it is not impossible. Thus, the grandson should retain an experienced probate lawyer as soon as possible to review this matter.
Note that, given the significant services the grandson rendered to the decedent over the past 15 years, it is possible that he would have a claim against the grandparent's estate for payment for these services. Such a claim might encourage other family members to play ball with him. Good luck to you.
This information is presented as a public service. It should not be construed to be formal legal advice nor considered to be the formation of a lawyer/client relationship. I am licensed in Connecticut and New York and my answers are based upon the law in those jurisdictions. My answer to any specific question would likely be different if I were to review a client's file and have the opportunity to interview the client. Accordingly, I strongly urge you to retain an attorney in your jurisdiction with respect to any legal matter.
It is possible to challenge a will, but it is difficult and expensive. You are asking for case law; does this mean you are trying to do this yourself? I would strongly advise against this. Challenging a will is not the easiest thing in the world, even for experienced attorneys.
This posting is for informational purposes only. It is not legal advice, nor does it establish an attorney-client relationship. For more information, please visit www.justinelderlaw.com.