These questions are an expression of deep conviction that Saul is the one whom Yahweh wants to be the king that the Israelites are looking for. The questions can be translated as statements. AT: "You should know that it is on you that all the desires of Israel are set. They are set on you and your father's family." (See: [[rc://en/ta/man/translate/figs-rquestion]])
Saul is expressing surprise because Benjamin was the smallest tribe in Israel, and other Israelites considered the tribe unimportant. Also, Benjamites considered the clan of which Saul was a member as unimportant. These questions can be translated as statements. AT: "I am from the tribe of Benjamin, the least important of all tribes. And my clan is the least important clan in our tribe. I do not understand why you are saying that the Israelite people want me and my family to do something important." (See: [[rc://en/ta/man/translate/figs-rquestion]])