Netflix device limit?

My father bought Netflix for us and said that we can watch four devices at the same time for a month and after this month only two devices at the same time. Could three devices be watching when two devices are looking online and one device is watching downloaded things from Netflix (offline)?

Well so-called it is so that if you take the 2 subscription with 2 devices then only 2 devices can watch at the same time. However, I don't know whether it also applies to offline. You have to try it out