MOGADISHU, Jan 10 (Reuters) - A rocket-propelled grenade fired at an Ethiopian military truck in Mogadishu on Wednesday hit a Somali family home and killed at least one, a Somali government source said. "Somali militia fired a rocket propelled grenade, but it missed the truck and hit a family house behind. There is a casualty," the source said of the attack in the Arafat area of north Mogadishu.