The Biggest Loser: Families is the sixth season of the NBC reality television series The Biggest Loser. The sixth season premiered on September 16, 2008,[1] featuring Alison Sweeney as the host and Bob Harper and Jillian Michaels as the contestants' trainers.
The cast was revealed on August 29, 2008. Eight duos began the challenge, adding up to a total of 16 contestants.[2]
From Week 1 to Week 5, the Green, Red, Orange & Brown Teams trained with Bob, while the Purple, Gray, Yellow & Pink Teams trained with Jillian. In Week 5, these "Family Teams" were disbanded and the contestants were split into the Blue Team and the Black Team. In week 8, the teams were split again and the competition went into individuals.

Fonte: wikipedia