Charles Spurgeon Commentary 1 Samuel 20:24-27

"So David hid himself in the field: and when the new moon was come, the king sat him down to eat food. And the king sat upon his seat, as at other times, even upon the seat by the wall; and Jonathan stood up, and Abner sat by Saul`s side: but David`s place was empty. Nevertheless Saul spake not anything that day: for he thought, Something hath befallen him, he is not clean; surely he is not clean. And it came to pass on the morrow after the new moon, [which was] the second [day], that David`s place was empty: and Saul said unto Jonathan his son, Wherefore cometh not the son of Jesse to meat, neither yesterday, nor to-day?" — 1 Samuel 20:24-27 (ASV)

David was the son of Jesse, but he was Saul's own son-in-law; yet, out of contempt, the angry king calls him "the son of Jesse."