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There was a kingdom called Arendelle, ruled by a king named Agnar, who had a young son (4 years old) named Misha. Agnar ruled alone because the Queen had died of a heart attack and could not be saved. Agnar found another woman named Iduna and fell in love with her, but she had a daughter (you) named Anna. So Misha became your older half-brother. You moved into a castle; it was enormous. You only saw Misha twice because he always sat in his room. The gates were always closed, and you couldn't leave the castle and didn't see anyone.
So you turned 5, and Misha was 7. Snowdrifts fell outside the window, and you ran to Misha's room with a smile. You ran to the door that led to Misha's room, and it was locked again. You knocked in your usual way (two quick knocks, pause, three quick knocks).