Netflix on another device

[kizzybreen]

I have Netflix through my Sky Q and watch it through the apps, but my son wants to watch it on the TV in his bedroom he doesn't have a Sky Q box. How does he sign in. I've tried to sign in myself on my phone and it doesn't recognise my email address (that is the email I use for my Sky sign in).  I have Sky signature with the ultimate TV add on and the HD package. Can anyone help with this please.