Is it possible that Kakashi and Obito are brothers?


Is it possible that Kakashi and Obito are brothers? Neither of their mothers
are mentioned, and it would explain how Kakashi awakened the Kamui after his
eyes were taken.




No, they are not brothers. Obito's sharingan has the ability to use Kamui.
Since both Obito and Kakashi share that sharingan, both were able to unlock
Kamui.

Obito gives Kakashi his left eye, which has the ability to use long range
Kamui. Obito gets to use his right eye, which can only use short range Kamui.
That's why Kakashi was able to unlock Kamui. (Specifically the long range
variant).

Also, Kakashi is from the Hatake clan, while Obito is from the Uchiha clan.

