The Treehouse is a major alliance formed in BB5.
The Treehouse formed in the beginning phase of the game, with NP wanted to re-align with both LC and TE (players who worked with closely in BB4) as well as Draskk, a powerhouse player he wished to mend ties with after blindsiding him in the same season.
However, Hermes' intrusion to the game proved to be a massive problem long term, as he was a player in Draskk's eviction, and in the late game managed to send Jade, LC, TE, and NP to the jury one by one.
The alliance ultimately did not have one of its members crowned as the winner, but held a strong majority once they managed to take out the leader of the Anti-Alliance, Violet. This alliance likely would have succeeded in the end, but Hermes' competitive might was too much for the entire game to deal with, and in the latter half of the game the alliance was systematically eliminated.