At the end of the events of Season 2, Hopper adopts Eleven officially as his daughter "Jane". In 1985, Hopper is very jealous and protective over Eleven due to the events of their past year and a half of living together.

Is Eleven related to Hopper?

Jim Hopper

Chief Hopper was an ally of Eleven and later became her adoptive father.

Is 11 Jim Hopper's daughter?

In “Chapter Six: The Spy,” the bracelet is seen on Hopper's wrist as he calls Eleven on the radio and apologizes for real. After Dr. Owens (Paul Reiser) forges a birth certificate which makes Eleven Hopper's legal daughter, Hopper gifts Eleven the bracelet, which she then wears to the Snow Ball.