How many devices can run Different Netflix videos at the same time

So, out family of four has one Netflix account. I have logged onto it on our Xbox, my iPhone, my laptop, my brothers laptop, my dads iPad, my dads iPhone, and even more. I was just wondering, lets Saugus four of us, my mom dad brother and I, all logged onto Netflix on our computers simultaneously and began watching something different each. Is this possible? If an account only supports one or two devices at once what happens when someone else tries to watch something? I'm just curious because my dad is watching a tv show on Netflix on his iPad right now and my brother and his friend are using Netflix for the Xbox, and I wanted to watch somethin on my computer. I don't want my dad to be messages though saying something like "another user is trying to access ACcount" cuz he thinks I'm in bed but I want to watch some tv.

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I think it depends on the account. My brother has a neflix account and he has it so that our family of four can watch two things at the same time. But if a third person tries to watch something it says that too many accounts are in use and won't let you watch it. But it won't tell him something