The 15-year-old suspected of murdering his parents and three of his four siblings at their Washington state home early Monday was charged in juvenile court Thursday with five counts of first-degree domestic violence murder and one count of first-degree attempted murder with a firearm enhancement. Prosecutors say they will ask a judge to move the case to adult court, which would allow the teen to be held—if convicted—past age 25, KUOW reports. Meanwhile, more details about the tragedy were revealed, including the fact that the suspect himself made one of the 911 calls. He told the dispatcher he…