According to the author of Chronicles, this verse tells us that Mikloth had a son named Shimeam, and they lived in Jerusalem with their family, close to other relatives. It shows how families and their connections were important to the people living in that city.
1 Chronicles 9:38: And Mikloth begat Shimeam. And they also dwelt with their brethren at Jerusalem, over against their brethren.
The names and order of Saul's sons are different from the genealogy listed in 1 Chronicles 9:38.
1 Samuel 14:49: Now the sons of Saul were Jonathan, and Ishui, and Melchishua: and the names of his two daughters [were these]; the name of the firstborn Merab, and the name of the younger Michal: