Joiada was the father of Jonathan, and Jonathan was the father of Jaddua.

Saul, his son Jonathan, and the army that remained with them stayed in Gibeah in the territory of Benjamin, while the Philistines camped in Micmash. ¹ 

The sons of Jada, Shammai’s brother: Jether and Jonathan. (Jether died without having sons.)

The Hebrews who had earlier gone over to the Philistine side ¹  joined the Israelites who were with Saul and Jonathan.

But Jonathan had not heard about the oath his father had made the army take. He extended the end of his staff that was in his hand and dipped it in the honeycomb. When he ate it, ¹  his eyes gleamed. ² 

Then he said to all Israel, “You will be on one side, and I and my son Jonathan will be on the other side.” The army replied to Saul, “Do whatever you think is best.”

So ¹  all these officers and their troops came to Gedaliah at Mizpah. The officers who came were Ishmael son of Nethaniah, Johanan and Jonathan the sons of Kareah, Seraiah son of Tanhumeth, the sons of Ephai the Netophathite, and Jezaniah son of the Maacathite. ²