Parents can rest easy because they are the ones who control what their children do in the application.
They are the ones in charge of adding their contacts, which means that they will not be able to speak with someone to whom the parents have not given their approval.
The conversations are encrypted, which provides more privacy.
Parents can see all the conversations their children have, but they will not be able to participate in them.
They will have the power to approve the sending and receiving of images and videos.