Sounds Like They Have Nothing Between Their Headphones

I am on an airplane. There is a young child sitting in front of me who is having a fit. The child’s mother takes out a tablet and turns on a video, with the volume on. This calms the child, who is no longer screaming.

A flight attendant asks the mother to turn the video off, as they aren’t wearing headphones. As soon as the video is off, the child resumes screaming.

That might be a policy they have, but I would much prefer the sound coming from the video than the one from the child!