'Grandfather' in the Bible

David said to him, “Do not be afraid, for I will certainly show you kindness for the sake of your father Jonathan, and will restore to you all the land of your grandfather Saul; and you shall always eat at my table.”

Then the king said, “And where is your master’s son [Mephibosheth]?” Ziba said to the king, “Behold, he remains in Jerusalem, for he said, ‘Today the house of Israel will give me back the kingdom of my father.’”