Fili

Family
Fíli is a descendant of the Line of Durin, and directly descended from Durin the Deathless. Dís is Fíli's mother, and does love her, yet scared of her. Thráin was his maternal grandfather. Thrór was his great-grandfather. His father is unknown.

Kíli
Clearly, these two brothers are partners-in-crime and best friends. Fíli is caring, protective and strict over his younger brother. They tease anyone, including themselves. Although not twins, they are inseperable. Fíli is always there for his brother as Kíli is always there for Fíli. They arrive together at Bag End, and sit by the fire before they teased Bilbo on Orc raids. Both of them were tasked to watch the ponies, and even though Fíli is older than the two, he follows his brother's lead.

Thorin Oakenshield
Through his sister, Thorin is Fíli and Kíli's maternal uncle. They are considered his sister-sons over being referred to as his nephews. Fíli was raised by Thorin, and Fíli came to love Thorin as a father figure, hardly knowing his own father. Sometimes Fíli and Kíli don't bother to tell their uncle about things. They send Bilbo out to the trolls rather than ask Thorin for help.

Bilbo Baggins
Fíli became one of Bilbo's friends, along with the other dwarves. Fíli takes the pleasure in teasing Bilbo, as if he was their younger brother. He and Kíli get Bilbo involved into their schemes. He abandoned Bilbo to the trolls, but they both came back in the end. Fíli and Kíli were among the others that wanted Bilbo to come back. When Bilbo does come back, Fíli is relieved to see the hobbit alive and well.

In The Battle of the Five Armies, Fili refuses to harm Bilbo when Thorin is under the impression Bilbo betrayed them and even screams "no" when Thorin tries to kill Bilbo. After the hobbit falls down, Fili helps Bilbo up, along with Bofur.