Big Brother Big Brother 5 - Episode 21 summary 08/25/2004 "Screw Your Sibling," our episode summary for the twenty-first episode of CBS' Big Brother 5 series, written by GuessItRains, is now available. Read More RELATED NEWS 'Big Brother' host Julie Chen marries CBS president Les MoonvesBig Brother 5 - Finale episode summaryCBS's 'Big Brother 5' finishes big, draws biggest audience of the season TAGS: Big Brother