Share in grand father & g.mother properties

Dear Lawyer, My Father and Mother are farmers, They both purchased some agricultural properties may be from their own income or by thier ancestral property income.After thier death we all brother and sisters divided the properties.Now my childrens are asking share in that properties.They are all stating that these will become their ancestral property. My father& mother purchased properties will become seperate properties to me or not.My childrens have any rights on these properties.Please reply. Regards Hari.