(Washington Post) – Abdullah Ali’s 15-year-old son disappeared from home one morning three months ago. A week later, the boy called his horrified family to say he had joined the Shiite insurgents known as Houthis — becoming one of a growing number of underage soldiers fighting in Yemen’s civil war. “He’s just a child. He’s only in the ninth grade,” Ali, 49, a civil servant who lives in the city of Taiz, said recently. “He should be at school learning, not fighting.”