Parallel to Netflix look unnoticed?

When I watch a downloaded series on Netflix without a connection to the internet, does my brother see something on the TV at the same time watching on the Wi-Fi that I watch a series and if so which one?

No, what you have downloaded, you play off with you.

Do you use the same account and the same profile, of course, he sees what was downloaded.

But it is also possible to watch multiple streams simultaneously on different devices, depending on the subscription.