RFID is a promising technology that uses source-free tags for object tracking. Multiple tags can be attached to a single object to improve the object detection probability. However, the total identification time may also multiplied due to the increased tag population. This letter presents a brother tags filtering-based identification scheme (BFI), which is the first scheme designed for multi-tagged object identification. The brother tags denote the tags attached to the same object. By iteratively identifying tags and filtering the remaining brother tags attached to the identified object, BFI avoids unnecessary brother tag transmission. Performance analysis and simulation results show that the proposed scheme performs much better than the existing anti-collisions schemes in time-efficiency.