Five years after the success of Let's Be Cops, Luke Greenfield is stepping behind the camera again to direct the comedy Half-Brothers for Focus Features, Collider has exclusively learned. One of Mexico's biggest stars, Luis Gerardo Mendez, is attached to star in the film, which follows two half-brothers who are put to the test when they're sent on a wild goose chase to uncover their dying father's mysteries. Eduardo Cisneros (Instructions Not Included), Jason Shuman and Greenfield co-wrote the script, and the three of them will produce alongside Jason Benoit. Production is slated …