Mods, I have a question. I have a close friend that sees my like all the time on ATRL and I showed him how fun it is, so knowing him he will probably sign up. But the thing is, he is often at my house. So if he makes a account there is a big chance he will log in on my computer once in a while (with my Ip address) and I would log in on his computer..... well never

I hate going to his house.
My question is how would you know It's not a duplicate account? Or will you guys even approve a account in this case? Or let's say (totally random) my brother signs up, we have the same IP address because we share the same wi-fi.
How would you guys deal with this?