IFC Films’ Your Sister’s Sister trumped the weekend’s openers in a generally quiet weekend in the specialty box office. The Lynn Shelton-directed feature debuted in 13 theaters, grossing $117K for a respectable $9K average. An IFC Films spokesperson said, “It was a solid opening weekend for the film as we will open the top 30 markets this coming weekend.” Sundance doc Marina Abramovic The Artist Is Present bowed in two theaters, grossing just under $11K for a middling $5,495 average. HBO Films came on board for the project after seeing its installation at New York’s Museum of Modern Art and Music Box Films is handling theatrical. Fellow Sundance doc Something From Nothing: The Art Of Rap directed by Ice-T bowed in 157 theaters, grossing $150K for a paltry $955 average.