Board Thread:Theories and Speculation/@comment-25132842-20180312025951/@comment-34752936-20180327082707

For better understanding let me give you an instance. MS happens when a person kills someone very close to him/her. So the 'tamui' of the Sharingan changes on its own[how tamui changes it's pattern is still not explained].

Coming to EMS, a person can achieve it once he discards his own eyes and uses his sibling's ones. That is the mechanism of achieving EMS. Therefore if the person is closely related to the one who he would take the eye from, then there is a greater percentage of activating EMS. Hope I have answered your question now.