11See, my father, see the corner of your robe in my hand. For by the fact that I cut off the corner of your robe and did not kill you, you may know and see that there is no wrong or treason in my hands. I have not sinned against you, though you hunt my life to take it.
Father could be used as an honorific title as in 2 Kings 5:13.1 Alternatively, it is simply a recognition and reminder to Saul that David is his son-in-law.2
11 See, my father, see the corner of your robe in my hand. For by the fact that I cut off the corner of your robe and did not kill you, you may know and see that there is no wrong or treason in my hands. I have not sinned against you, though you hunt my life to take it.