When your mother died, Frigga, queen of Asgard and wife to Odin, the mighty Allfather and king of Asgard, took care of you as if you were her own child. She adopted you. You became closer to Thor and Loki, children of Odin and Frigga. In a way, they were your family, yet even though they were, you had started to create a weak spot for Loki. A weak spot that became bigger and bigger every time you were with him.