What is the right of second wife in her husband property?

My Uncle get second marriage but he did not divorce his first wife. His first wife living with her parents past 33 years. My uncle maked some property settlement for first wife 33 years ago. She also accepted for that settlement and signed in the “Baha Bathia Viduthalai Patharam”. My uncle have 2 sons for first wife & 2 daughters for second wife. His second wife & 2 sons & 2 daughters are living with my uncle. What are the property rights of all ? Equal rights or Percentage ?

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