Indeed they are. Fili is the older and more responsible one, whereas Kili is more carefree and does not feel the pressure of royalty as much as his older brother. Fili and Kili were both born of Dis, Thorin Oakenshield's sister. So, to Thorin, they are his sister-sons, and to Fili and Kili, Thorin is their uncle. They became rather close to Thorin, who became their idol, and developed a thirst to impress him.
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I don't think their last names are mentioned. Maybe they are Oakenshields, because they are Thorin's nephews.
Fili- Dean O'Gorman Kili- Aiden Turner
Kili is one of Thorin's nephews, born to his sister Dis and has one other brother: Fili. In movie, he uses a bow. He is one of the most handsome dwarves and he is royalty of the line of Durin.
In the book, it was Kili and Fili. ". . . finding still hanging there many golden harps strung with silver they took them and struck them; and being magical . . . they were still in tune."
-_- don't just ask google. actually read the book. you're not fooling anyone into giving you those answers
Kili and Fili have little fiddles Dori, Nori and Ori play flutes Bombur has a drum Bifur and Bofur have clarinets Dwalin and Balin have Viols Thorin plays a Golden Harp