they help him do amustasu,put people in his spical genjustu,also he can do tsumi
They are equal in strengh
Idashi Uchiha made no (Public) appearences in Naruto Manga/Anime or Naruto Shippuden Manga/Anime. Idashi appeared in the story after Manga Chapter 250 of the Naruto Childhood series (Which Never aired to the public) . at some point of that duration Naruto fought Idashi to see who would be stronger and it turned out they were equal in terms of Strength.
idoshen, known as Idoshen Uchiha, is the brother of Madara. He is also the father of idashi uchiha. Idoshen was truly killed by his older bother madara. but rencarnated his powers in to his son known as idashi madara has only about 10 percent of his sharingan. basically idashi has two sharingans his own and his fathers.
Madara is by far the strongest. If Itachi was stronger he would've killed madara himself.
Do you mean Itachi Uchiha? He first appears in Naruto: Shippuden in person in episode 12 and chapter 255 of the manga. WEL THERE IS SUPOSE TO BE A DUDE NAME IDASHI DAT WILL APPEAR AFTER THE WAR IS OVER HE IS SUPOSE TO BE A SUVIVOR OF ITACHI'S DESTRUCTION BESIDES SASKUE...BUT WE WILL C IF THIS IS A SPOILER....I THINK IT IS PERSONALLY
The special eyes of the Uchiha Clan is the Sharingan.
The red eyes of the Uchiha clan are known as the Sharingan.
Itachi is Sasuke's elder brother
Danzo gets Sharingan by killing Uchiha and taking their eyes
Madara Uchiha's eyes were taken by his protege Obito Uchiha in order to activate the Infinite Tsukuyomi, a powerful genjutsu that placed the entire world under his control. Madara later transplanted his Rinnegan eyes into Nagato to influence the Akatsuki's plans.
By taking out his brother's eyes, and transplanting them in with his own eyes, making an ultimate Sharingan, causing him to be immortal. ! - NarutoFan2000
If I am correct, Sasuke is his great great (etc.) nephew or grandson. But you should check another website first, because I'm probably wrong. :3 Hope this helped! :)