'Grandfather's' in the Bible

The king asked, "Where is your master's grandson?" Ziba replied to the king, "He remains in Jerusalem, for he said, 'Today the house of Israel will give back to me my grandfather's kingdom.'"

For my grandfather’s entire family deserves death from my lord the king, but you set your servant among those who eat at your table. So what further right do I have to keep on making appeals to the king?”