No, Arwen and Legolas are not siblings; they are from different Elf families, though they are related through distant kinships and become connected by marriage when Arwen weds Aragorn (Legolas's companion), making them related by adoption/in-law status. Arwen is the daughter of Elrond, with brothers Elladan and Elrohir, while Legolas is the son of Thranduil.
She was the granddaughter of Galadriel and Celeborn and often called Arwen Undómiel or "Evenstar". Through Aragorn, Arwen was the adoptive sister-in-law of Legolas Greenleaf and the paternal adoptive aunt of their children: Anna, Nessa, Thaulius, and Nellriel Telcontar.
Arwen is one of the half-elven who lived during the Third Age; her father was Elrond half-elven, lord of the Elvish sanctuary of Rivendell, while her mother was the Elf Celebrian, daughter of the Elf-queen Galadriel, ruler of Lothlórien. She marries the Man Aragorn, who becomes King of Arnor and Gondor.
Tauriel is a Silvan Elf, which means she is of a much lower order than the elves that had previously been seen in The Lord of the Rings film series, and holds a lower social status than characters like Arwen, Galadriel, Elrond, and Legolas.
He heard all about Thranduil from his dad and his buddies. Technically Legolas is a prince. so saying legolas son of Thranduil would let everyone know he is the elven prince. Which he didn't want to freely admit.
Tolkien's Legolas is extremely introverted. He just doesn't have much to say directly to anyone, perhaps because he's thousands of years old. His odd relationship with Gimli draws him out in a way the hobbits never do, and that's mostly after Frodo and Sam leave the Fellowship.
Tolkien's description of Gollum conforms to a Catholic – and Thomistic – account of envy, which is a “sadness of the soul”; and it is Gollum's unbearable sadness and his unquenchable desire for the one Ring that marks his character.
The movie the Battle of Five Armies expanded on Tolkien's canon by saying that the white gems Thranduil wanted back from the dwarves were originally intended for her, but that she was captured and taken and tortured to death by Gundabad orcs before the order was completed.
Elrond chose the fate of the Elves and therefore the choice was presented to his children. The reason why Eldarion and his sisters (the children of Aragorn and Arwen) were born mortal was because Arwen chose mortality and therefore that fate was passed on to the rest of their line.
By lingering behind, she chose mortality so she could rejoin him. She died a year after him of heartbreak if I recall correctly. She chose a mortal life to be with Aragorn, as such she could no longer travel to or set foot upon Valinor. Gimli, Bilbo, Frodo, and Sam were the only mortals ever granted passage to Valinor.
If Gandalf had stayed dead after his sacrifice in The Fellowship of the Ring, then his demise would be the saddest in the trilogy, but since he came back, the saddest single death scene of all three movies goes to Boromir's.
He is a Sindar Elf of the Woodland Realm and son of its king, Thranduil, becoming one of the nine members of the Fellowship who set out to destroy the One Ring. Though Dwarves and Elves are traditionally rivals, he and the Dwarf Gimli form a close friendship during their travels together.
He can't simply leave Galadriel to her fate, though. So, we must intuit that Elrond kissed Galadriel in order to distract Adar and the Uruk (who were so shocked that two characters who have no business kissing were kissing they forgot to pay attention) from the rest of what he was doing.
Just like it had happened with their parents (also Half- Elves), they were given a choice to choose the life of an Elf or the life of a Human. Elrond chose the immortality of Elves, and his brother chose the Humans, the first one to do so. He lived 500 years, which is not too shabby.
He attacks the Orcs in rage, and is later confronted by Bolg. He saves Tauriel from being attacked by Bolg, but is mortally wounded during the fight. Kíli dies with Tauriel by his side. Bolg is eventually killed by Legolas while Azog is killed by Thorin himself avenging the brothers.
After the battle and Thorin's death, Thranduil took Orcrist, which was previously confiscated in Mirkwood, and laid it upon Thorin's tomb. The treasure was divided among Elves and Men, and Thranduil received the emeralds of Girion.
She was captured and tormented, receiving a poisoned wound. Her sons rescued her and she was physically healed by Elrond, but never fully recovered in mind or spirit, and no longer wished to stay in Middle-earth. She left for the Grey Havens and passed over the Great Sea the following year.
The Posttraumatic Stress Disorder of Frodo Baggins
J.R.R. Tolkien in The Lord of the Rings accurately portrayed the signs and symptoms of what is currently labeled Post Traumatic Stress Disorder. Frodo's condition logically follows his experiences of less than a year in the War of the Ring.
Merry and Pippin both died decades BEFORE Aragorn died. Merry and Pippin died in FA 63, while Aragorn died in FA 120 - and it was after this that Legolas and Gimli sailed to the Undying Lands. All of this is made patently clear in Tolkien's own timelines.
The clearest same-sex relationship in the novel, in the eyes of scholars, is that of the ringbearer Frodo Baggins and his servant, originally his gardener, Sam. Tolkien described their relationship as like that of an officer in the British Army and his military servant or batman.
As a Maia, Gandalf was an angelic being in human form, in service to the Creator (Eru Ilúvatar) and the Creator's 'Secret Fire'. He took on the specific form of an old man as a sign of his humility. His role was to advise but never to attempt to match Sauron's strength.
The Ring's effects
Inversely, the hobbits' good-naturedness and lack of ambition makes them less susceptible to the Ring's promises of power, as in Frodo and Samwise Gamgee, who are able to handle the Ring for extended periods of time.
If by my life or death I can protect you, I will. What does your heart tell you? But I am the real Strider, fortunately. I am Aragorn son of Arathorn; and if by life or death I can save you, I will.