The family of 7-year-old Charlie and 5-year-old Brandon Powell held a public memorial service for them on Saturday, nearly a week after their father killed them and himself in a gas-fueled blaze. Their mother, Susan Powell, has been missing for two years and their father, Josh Powell, had been declared a person of interest in her disappearance. Hundreds of people attended Saturday in Tacoma, Wash., some wearing purple and blue ribbons in memory of the boys. Family members and the boys’ teachers are scheduled to speak. Recently released divorce papers from their grandparents’ divorce showed that both grandparents had concerns about Josh Powell from early on.