Laufey is the adopted brother of Thor, and son of Odin. Loki was born a Frost Giant, the race of the mortal enemies of Asgard. Odin adopted Loki and raised him as his own.

Is Loki actually adopted?

Adopted by Odin

In 965 A.D., not long after the war between the Giants and the Asgardians, Loki was found by King Odin. Adopting Loki and using sorcery to alter his appearance to make him appear to be an Asgardian, Odin raised Loki and his biological son, Thor, with his wife Frigga.

Was Loki really adopted by Odin?

While the Loki of the Marvel comics and films does derive his cunning character from the Loki of Norse myth, the biggest difference is that in the Marvel universe, Loki is depicted as the adopted brother and son of Thor and Odin.