My grandfather passed away at 1988 and there were 7 sons , 1 daughter and his wife became his legal successors. In 1990 one of his saon passed away so his son and wife together entitles his share. In 1992, all legal successors came together and made a particition deed. Every one was awarded equal share because the lands in the main road will cost and rural area will cost less. Hence some got large number and while some other got less. But all of them participated the processess and the registration was done in 1992. Now in 2016, the wife and son of one of my grandfathers son ( who deceased at 1990) claiming that the partition was not done correctly and needs to be set aside and do the partition again. Whether this will stand in front of the court? The document happend 25 years back and can they question this now?