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.
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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
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! :)
Itachi Uchiha part of the Uchiha clan also a member of the akatsuki
Uchiha MikotoUchiha Mikoto
these are all i know-naruto uzumaki-kakashi hatake-Chouji Akimichi-Genma Shiranui-Yoroi Akadou-zabuza Momochi-sakura Haruno-Shikamaru nara-shino Aburame-kiba Inuzuka-kakashi hatake-hanabi Hyuuga-neji Hyuuga-hinata Hyuuga-Chouza Akimichi-Tsunade Godaime (this is just his hokage title not really her last name)-Itachi Uchiha-sasuke Uchiha-fugaku uchiha- Izuna uchiha-Madara uchiha-Uruchi uchiha-Teyaki uchiha-Tekka uchiha-Shisui uchiha-Shisui uchiha-obito uchiha-Kyuubi no Youkoi know more but i cant remember all of their last name