How many mobile lines can my account have?

I’ve got 6 lines on my account (taking advantage of the multi-line discount). I read a couple years ago that 6 is the max amount of lines you can have in one account. I just want to check if that is still true? I have some family members that would like to also join videotron and I’m wondering if I can add them to my account (with their own plans) or if I’m maxed out and they have to start their own family account?
Thanks