1. As per your narration it's ancestral property and your mother could have gifted to her son her entitled share in the property only and not the entire property, including your entitled individual share in the property.
2. Daughters are also treated as coparceners since birth on par with their brothers in respect of ancestral property and daughters are entitled to equal share in the ancestral property as that of sons.
3. You can challenge in the competent court for partition, declaration and separate possession of the property by metes and bounds. Before filling the case, you can send a legal notice to your mother regarding your entitlement to your individual share in the ancestral property and in the event of not receiving positive response from your mother, then you can file a case in the court for your entitled share.
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