"Holy shit. Andromeda!" When Sirius was a child, Andromeda was their favourite cousin. Unlike all other members of the Black family, she treated Sirius like a kid: played games with them, answered their questions, held them when they cried. They were still very young when she ran away, but she still features in most of Sirius’ pleasant childhood memories. After she left, it was like she was completely erased. No one spoke of her again and it was impossible for Sirius to track her, even after they themself escaped the family. They were never completely sure that they didn’t make her up.