My cousin Sister had registered a will of a Property/Plot owned by her in Collector's colony Chembur. This property was transferred on her name after the death of her Husband. The property card was originally in the name of my brother-in-law and now the name in the property card is my sister's name who has also expired. She has made a will mentioning some amount to be given to her father's side thats us and some amount to be given to her Husband's side. My query is -" Is the will Valid?" Is it true that such property can be distributed through only succession certificate and can be applied by only the Husband's Family and not her father's family?