Saul's father Kish and Abner's father Ner were sons of Abiel.

1 Samuel 9:1
Now there was a Benjamite, a powerful man, whose name was Kish son of Abiel, the son of Zeror, the son of Becorath, the son of Aphiah of Benjamin.

1 Samuel 9:21
Saul replied, "Am I not a Benjamite from the smallest tribe of Israel, and is not my clan the least of all the clans of Benjamin? So why would you say such a thing to me?"

1 Samuel 14:50
His wife's name was Ahinoam daughter of Ahimaaz. The name of the commander of his army was Abner, the son of Saul's uncle Ner.

1 Samuel 26:5
Then David set out and went to the place where Saul had camped. He saw the place where Saul and Abner son of Ner, the general of his army, had lain down. Saul was lying inside the inner circle of the camp, with the troops camped around him.

And Kish was the father of Saul; and Ner the father of Abner was the son of Abiel.