1. Does Fairy Tail know Natsu is end?
2. Does Natsu find out that zeref is his brother?
3. Can Natsu turn into a Dragon?

Does Fairy Tail know Natsu is end?

The only characters that know about Natsu being E.N.D. are Natsu himself, Zeref, Invel, Gray, Lucy and Happy. However, August (Zeref’s son) and Rakheid (a failed version of Natsu created by Zeref) might know who he is.

Does Natsu find out that zeref is his brother?

Zeref ultimately survived the attack as Natsu prepared to attack him once more but Zeref stopped him in order to finally reveal the truth. Zeref tells Natsu his full name is Zeref Dragneel and states he is Natsu’s older brother.

Can Natsu turn into a Dragon?

Natsu will no longer become a full Dragon. In order to for a Dragon Slayer to transform into a dragon as in the case of Acnologia, a Dragon Seed must first develop inside the body of the Dragon Slayer which eventually turns them into a dragon.