The problem is that Bungie made the Taken King only be on the Profile you bought it on, which is actually a violation of Microsoft's contract rules. One question you guys are on the same console right? If yes then yea you can't play it sadly. I have the same problem with my brother and I. We'll just have to wait for bungie to change it or atleast complain to them :( Sorry to see you are having the same problem as I