As it happened, Charlotte did shortly gain another brother: Prince Louis, born in 2018. And, because of the new rules, her baby brother did not displace her position. She remained fourth in line to the throne, and Louis took his place behind her. Are you with us so far? Anyway, next in line after Louis is Prince Harry. William’s younger brother is sixth in line to the throne and his baby son, Archie, is seventh to inherit the British throne.