We know that Elrond's father Eärendil was a half-elf, the son of the human hero Tuor and the elf Idril. The only example of a human-elven marriage in the First Age was Beren and Lucien, whose granddaughter was Elwen, who married Eärendil. This brings together two people of half-e

We know that Elrond 's father Eärendil is a half-elf. He is the son of the human hero Tuor and the elf Idril. The only example of a human-elven marriage in the First Age was Beren and Lucien, whose granddaughter was Elwen, who married Eärendil. This brings together two people of half-elf blood.

Elwen's father Dio was the only child of Beren and Lucien. At the end of the First Age, Eärendil and Elwen went to the Western Undying Lands and begged the Valar to save Middle-earth and bring it to the West. Delivered from the clutches of Morgoth. Eärendil and Elwen sailed westward to an almost dead end. With the help of the Silmarillion, they succeeded.

For this reason, Valar did send an army to deal with Morgoth. This was also Valar's best move to verify the half-elf couple. "The Silmarillion" describes it this way:

When the gods had finished speaking, Manwë gave his verdict. He said: "In this matter, the judgment of fate is mine. Elendil was in danger because he had done something to the two. Because of the love of his kin, his life should not be in danger, and his wife Elwyn should not be punished, because she was involved in danger out of love for him; but they will never be allowed to set foot on the other side again, among elves or humans. My verdict on them is as follows: Erlandi Er and Elwin, as well as their sons, were individually free to choose their fate, and the fate of their kinship was judged by the fate of that kinship they chose to belong to."

We can see that Valamanvi was right. The elves have the right to decide. Firstly, they can never return to Middle-earth. Secondly, Manwë gives them a choice. They can choose either a normal human life or an elf identity. At the same time, Manwe also gave their sons Elros and Elrond the right to choose. "The Silmarillion" describes it this way:

So Elendil said to Elwing: "Choose first. Now I am very tired of the world." Because of Luthien, Elwing chose to belong to Iruvi The firstborn children of Tower were judged by the fate of the elves; and Elendil chose the same fate because of his love for her, although in his heart he was more inclined to the ending of humans and his father's people.

Elwin chose to become an elf, and Elendil also chose to become an elf, but in his heart he wanted to be a human. Later, it was their sons Elros and Elrond's turn to make a choice.