our grand mother have our ancestral agricultural land in her name . In paper she is the widow of my grandfather but she have children from another man without marriage. Now she made a registered will in favor of her sons from the second relation. These also gets a share from their father's agricultural land. My father has the maximum land which allowed by Uttar Pradesh sealing act . We are two adult brothers. Can we challanged the will which created by our grand mother or claimed our right on the land which she got from our grand father.