'Grandfather's' in the Bible

Abimelech son of Jerubbaal went to his mother’s brothers at Shechem and spoke to them and to all his maternal grandfather’s clan, saying,

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?”

There's a man in your kingdom in whom dwells the spirit of the holy gods. During your grandfather's reign, he was found to have insight, intelligence, and wisdom, like that of the gods. Your grandfather, King Nebuchadnezzar your kingly predecessor appointed him to be chief administrator over the magicians, enchanters, Chaldeans, and astrologers,