1 Samuel 10:9 As Saul turned to leave Samuel, God changed Saul’s heart, and all these signs were fulfilled that day. 10When he and his servant arrived at Gibeah, a procession of prophets met him; the Spirit of God came powerfully upon him, and he joined in their prophesying. 11When all those who had formerly known him saw him prophesying with the prophets, they asked each other, “What is this that has happened to the son of Kish? Is Saul also among the prophets?”
12A man who lived there answered, “And who is their father?” So it became a saying: “Is Saul also among the prophets?”
Noun - masculine singular construct | third person masculine plural
Strong's Hebrew 1: Father
In https://biblehub.com/1_samuel/10-12.htm, 25 out of 26 translate it as singular "father".