There is not enough information in your summary to give you much guidance. Is your grandmother alive or deceased? Are you a minor or adult? If your grandmother is deceased, you are an adult, and the property is titled in grandmother's name alone, AND if the Will leaves the property to you, then your mother and aunt really do not have much say in the matter. If they try to contest the Will, you would need to hire a lawyer to defend your case. But otherwise, they should be out of luck. If there are more facts which would make your situation a little clearer, please feel free to add them below.
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If the will was properly executed and submitted to probate court and states that you will receive the house then you should be able to receive the house if you have the legal capacity to do so. Contact a probate attorney for more information.
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If your grandmother has passed away and her will says you get the house, then you get the house. You do not have to be adopted to receive anything under a will. If your grandmother is still alive, she has to decide to keep you in the will. That raises the concerns that your aunt or mother will try to change your grandmother's mind about leaving you the house. That is a family issue and not really a legal one.
The information provided should not be considered legal advice. I am not licensed to practice in any State other than SC. The results of your case will depend on the presentation of evidence, the law and other factors that may change depending on an in depth analysis of the facts of the case. Please see an attorney before making legal decisions.