'Master's' in the Bible

Then the king summoned Ziba, Saul's attendant, and said to him, "Everything that belonged to Saul and to his entire house I hereby give to your master's grandson.

You will cultivate the land for him -- you and your sons and your servants. You will bring its produce and it will be food for your master's grandson to eat. But Mephibosheth, your master's grandson, will be a regular guest at my table." (Now Ziba had fifteen sons and twenty servants.)

I gave you your master's house, and put your master's wives into your arms. I also gave you the house of Israel and Judah. And if all that somehow seems insignificant, I would have given you so much more as well!

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.'"