Be the adult/parent here. Tell them they must, always, use headphones. And that if they do not comply they will lose the ipad for X hours (potentially increasing amounts of X for each subsequent infraction).
Then, actually apply the stated punishment when they test the boundaries.
Be the adult/parent here. Tell them they must, always, use headphones. And that if they do not comply they will lose the ipad for X hours (potentially increasing amounts of X for each subsequent infraction).
Then, actually apply the stated punishment when they test the boundaries.