The world of online gaming can have a strong emotional impact on children that parents often do not understand or even acknowledge. However, parental understanding can be vital for the emotional development of adolescents. However, conveying emotions can be challenging and thus can benefit from mediators which facilitate parent-child communication. In order to help raise parental awareness, we designed Motiis, a novel system that measures and tangibly visualizes children's emotions experienced during gaming sessions. Haptic feedback allows users to 'feel' the extent of the exhibited emotions. We assessed our system with 17 parent-child pairs through on-site evaluations. Results indicate a benefit of Motiis for raising emotional awareness among parents. The tangible and haptic aspects of the system help to engage with the data more consciously as the tangible visualization of the system requires active interaction with it. Motiis enabled parents to understand aspects of the emotional states of their children that are beyond the verbal communication skills of the children.