FYI...if you go to the CBS Big Brother Website...you will see that they have pictures of all the players.
http://www.cbs.com/primetime/bigbrother5/
There are three blank spots. My thinking says that three sets of twins are switching off.
IF you are interested in reading updates on the live feeds, I have found that the following is the best site for that:
http://www.canoe.ca/JamBigBrother5/home.html
John Powell writes an article about each show, but he also writes what's happening in the live feeds.
This sure beats the edited version which is aired on TV.