No he isn't. So far, there has been no mention of Naruto being related to Sasuke in any way.
[nope. naruto and sasuke are not related in any way at all. sasuke is in the uchiha family and naruto is in the uzumaki and is the son of minato. unrelated.]
Who beat sasuke in naruto shippuden?
In my opinion, Naruto is. I hate Sasuke.
No, Naruto does not eat Sasuke.
sasuke,because in all there battles sasuke won over half
Yuri Lowenthal plays Sasuke from Naruto.
Sasuke is 18 days older then Naruto
No, but Tobi (since he's Madara Uchiha) are both form the Uchiha clan. Although they both possess the Sharingan, they are not brothers. Itachi is Sasuke's brother. Madara (Tobi) is like Itachi and Sasuke's great-grandfather.
In Boruto, it is pretty much confirmed that they are indeed straight. But there has been proof of Naruto having feelings for both Sasuke and Sakura. The creator of Naruto explained that it was like a love circle, Naruto liked Sakura, Sakura liked Sasuke, and Sasuke had special feelings for Naruto.
It is unrevealed yet, even in the manga, if Naruto defeats Sasuke in Naruto Shippuden.
because sasuke is naruto's friend and he will never kill him
Yes, Sasuke does show up in Naruto Shippuuden.
He doesn't. >.<