How did the partition happen, by a registered or an unregistered partition deed?
If it was an oral partition then this cannot be disputed at this stage.
However you should be aware of the law of succession in this regard.
If your unmarried uncle is not survived by any class I legal heirs then the class II legal heirs can inherit his share in the proeprty.
he legal heirs of a deceased unmarried person are determined by the Hindu Succession Act, of 1956. The order of succession is as follows: Class I heirs: Parents and children of the deceased. Class II heirs: Brothers and sisters of the deceased and their children.
The order is given below for your reference, as per the order, your status falls on the fourth category, hence whatever your uncle C had inherited is right as per law;
CLASS IInd HEIRS
- Father
- (1) Son's daughter's son, (2) son's daughter's daughter, (3) brother, (4) sister
- (1) Daughter's son's son, (2) daughter's son's daughter, (3) daughter' daughter's son, (4) daughter's daughter's daughter.
- (1) Brother's son, (2) sister's son, (3) brother's daughter, (4) sister's daughter.
- Father's father; father's mother.
- Father's widow; brother's widow.
- Father's brother; father's sister.
- Mother's father; mother's mother
- Mother's brother; mother's sister.
Now you can decide what can be done on this