I don't think that's allowed, at least not on freebitco.in. I'm pretty sure each account is only supposed to be used by 1 person, see a quote from TheQuin below.
What the heck are you talking about? Any number of people can use a single account in any site. That is common sense. No gambling site would have issues with this logic and they wouldn't be able to differentiate in the first place unless the gambler specifically told them.
That's right. You'll have to take turns playing for free but you can all gamble together.
You are confusing the newbie. He still thinks that there is a possibility to play with multiple accounts from the same IP despite multiple suggestions from different posters.