your presentation of the case is not full or clear.
Any way, in any ancestral property -( not self earned ) - every member of the family whether son or daughter is having equal rights. even if any one such member is not alive but grand children are there then those grand children have the right to inherit that portion in equal proportion.
But, this is subject to any other linked justifiable litigation. this cannot be explained now since you have not expressed whether you have any liability towards them in any manner.
suppose you are lliable / indebted to them for x amount and your share from property is equal to or less than that x amount, then they can try for the adjustment-in several ways. Pl give your case clearly and seek solution.