Ivan's parents heard their son was found dead in a barrel from neighbors: Another of their children was killed

"We didn't want to tell them what happened until the autopsy was completed and before we knew for sure how Ivan passed away. The father-in-law and the mother-in-law learned from the neighbors that Ivan was killed, and then they heard the same thing in the news," says Danijela Stojanovic, Ivan's sister-in-law