So, Elrond and Elros are Galadriel's first cousins twice removed. (I think that's how that works.) And she would then be Aragorn's first cousin 30 or so times removed, and his wife's grandmother, so, grandmother in law. (She is Arwen's first cousin three times removed.
Aragorn was a descendant of Elros Tar-Minyatur. His ancestorArvedui was wedded to Fíriel, who bore their son Aranarth, making Aragorn the last descendant of Anárion as well. When Aragorn was only two years old, his father Arathorn was killed while pursuing orcs.
Through her great-grandmother, Idril, Arwen was a descendant of King Turgon of the Noldor. Through her mother, she was the granddaughter of the Elf-queen Galadriel of Lothlórien.
Aragorn is not half Elf, although he is a descendant of Elros, who is half Elf (and the brother of Elrond, the half-Elf who raised him), which explains why Aragorn's life span is unusually long.
The line of the kings of Numenor eventually became the kings of Gondor and Arnor, and it is from that line that Aragorn is descended. Which makes Elrond his uncle and Arwen his cousin, an unholy number of generations back.
In terms of genealogy, Elros would be Aragorn's great grandfather with about 60 "greats." This makes Elrond Aragorn's great, great, etc. uncle, and since Arwen is the Lord of Rivendell's daughter, she and Aragorn are first cousins many times removed.
Aragorn is a fictional character and a protagonist in J. R. R. Tolkien's The Lord of the Rings. Aragorn was a Ranger of the North, first introduced with the name Strider and later revealed to be the heir of Isildur, an ancient King of Arnor and Gondor.
Isildur's father was Elendil, descended from Elros, founder of the Kingdom of Númenor. Since Elros was half-elven, from the marriage of Beren to the elf Lúthien, he and his descendants enjoyed much longer life than other men.
Legolas was not related to Galadriel at all. Except as they were both elves. Legolas was from the el who had never left Middle-earth to go to Aman Valinor. Galadriel came from Aman where she was born.
Yet, since Tolkien does give family trees for other important Elves in the book, such as Galadriel and Elrond, it's clear that Galadriel is not Legolas's mother. (Besides, she is one of the Noldor, not a Silvan or Sindar Elf.)
In his notes, Tolkien remarks that Sauron saw Galadriel as his equal. Add that to the fact that she's untrusting of Sauron (yes, even when he's in his Annatar guise) and an unwavering, single-minded force, and it's more likely than not that Sauron feared Galadriel — or the potential she held to upend his plans.
A legend says that the Wizard Gandalf had brought such a stone, called the Elessar, from Valinor. He gave the Elessar to the Elven Lady Galadriel, and remarked prophetically that she would pass it to another, who will also be called Elessar. From this would come Aragorn's royal name Elessar (Quenya for "Elfstone").
Heir of Isildur was the title of thirty-nine lords of the Dúnedain descended in right line from Isildur the son of Elendil, from his son Valandil to Aragorn Elessar, who reunited the Kingdoms of the Dúnedain in Middle-earth.
The first line of the Kings of Gondor were primarily members of the House of Anárion. Elendil was the first King of Arnor and was succeeded by Isildur.
As we know from The Fellowship of the Ring, Isildur takes hold of his father's sword after he's killed in the battle outside Mount Doom. Isildur takes the ruins of his father's weapon and uses it to slay Sauron and take the One Ring for himself.
Elendil's son, Isildur, cut the Ring from Sauron's hand on the slopes of Mount Doom. Though counselled to destroy the Ring, he was swayed by its power and kept it "as weregild for my father, and my brother".
But it is revealed that Aragorn is one of the Dúnedain—a descendant of Númenor—blessed with long life. Éowyn is in disbelief because it is said that Aragorn's race had passed into legend. Aragorn says there are very few Númenóreans left by the time of the War of the Ring.
Yes, they are related. Isildur is a 24th generation descendant of Elrond's brother Elros. Isildur's father Elendil was the last Númenor-born Lord of Andúnië and was the leader of the Faithful who escaped the destruction of the island to Middle Earth.
He's half-elven and through Arwen (and also Aragorn) he is a descendant of Beren and Luthien. So will he like his mother (and grandfathers) be able to make the choice to be mortal (man) or immortal (elven)? Nope.
Before the events of The Rings of Power, she had spent centuries hunting down Sauron to the detriment of her reputation. The fact that she had saved his life, become his friend, and potentially even developed a little bit of a crush might have just been too shameful for Galadriel to share immediately.
