During the tour of his company, Ron begrudgingly admits to having *one* brother, while signaling two other men to avoid his guests, implying he has at least three. In Hunting Trip (2009), Ron admits to Leslie that he has at least two brothers. It is unlikely she would keep this from her husband Ben, who was one of the tour guests.
This episode takes place in 2017 when April and Leslie meet with Senator Boxer. However, Senator Boxer retired in 2016.