'Master's' in the Bible

Then the king sent for Ziba, Saul's servant, and said to him, All the property of Saul and of his family I have given to your master's son.

And you and your sons and your servants are to take care of the land for him, and get in the fruit of it, so that your master's son may have food: but Mephibosheth, your master's son, will have a place at my table at all times. Now Ziba had fifteen sons and twenty servants.

I gave you your master's daughter and your master's wives for yourself, and I gave you the daughters of Israel and Judah; and if that had not been enough, I would have given you such and such things.

And the king said, And where is your master's son? And Ziba said, He is still at Jerusalem: for he said, Today Israel will give back to me the kingdom of my father.