Then the king called Ziba, Saul’s servant, and said to him, “All that belonged to Saul and to all his house I have given to your master’s grandson.
The matter is here settled concerning Mephibosheth. 1. This grant of his father's estate is confirmed to him, and Ziba called to be a witness to it (Sa2 9:9); and, it should seem, Saul had a very good estate, for his father was a mighty man of substance (Sa1 9:1), and he had fields and vineyards to bestow, Sa1 22:7.
Commenting on 2 Samuel 9:9-13
Then the king called to Ziba, Saul's servant,.... Who had been his servant: and said unto him, I have given unto thy master's son; meaning either, as some, the son of Mephibosheth, Micha after mentioned; or rather Mephibosheth himself, the grandson of Saul, whose servant Ziba had been: all that pertained to Saul, and to all his house; all his paternal estate, or what he...
I have given unto thy master's son - Unless Ziba had been servant of Jonathan, this seems to refer to Micha, son of Mephibosheth, and so some understand it; but it is more likely that Mephibosheth is meant, who is called son of Saul instead of grandson.