Board Thread:Theories and Speculation/@comment-31099706-20170327120301/@comment-3965545-20170328185317

It has to be a blood relative such as a sibling and the sibling has to either have a MS, or a Senjutsu boosted Sharingan to break the full force Tsukuyomi, the watered down version can be broke by a strong Sharingan user. Also Sasuke does not need to enter CS2 to use its Senjutsu to boost his Sharingan.. he only needs it to spread a bit across his face.. so he most likely did that in real life to escape the watered down version.