If they won't voluntarily share the details of the will (e.g. show you a copy), you'd have to bring a legal action. If you have a reasonable belief that your grandfather would have left something to you in his will and that you are not getting it, you can bring a lawsuit agaist his "estate" (what he left behind) and the executor (your father, in the role of executor) to force them to show you the will and then, if you do get anything under it, to distribute your inheritance to you. Unfortunately, since you need to bring the legal action just to see the will if they won't voluntarily show it to you, you have to sue first before knowing if it's worthwhile to do so. If you wish to explore this option, preferentially, consult with a probate attorney--this type of law can be complex and is not for the layperson. If determined to do it yourself, contact the probate court clerk's office for basic instructions and forms.
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