In this book, and many more, no one did. The boys were sent somewhere else, or, as in this one, Edward dies a natural death. Which has always made more sense to me, that they were sent away, because why kill someone and then try to pretend nothing happened? The bodies could have easily been shown and it put out that they had sickened and died. Lots of children did. People may not have believed it, but they couldn't prove anything. Wouldn't have been worse than how things ended up.