Her family is a mystery, as she lied about most of it when she was going by the alias Cosmos Andersen. However, she does have a sister named Rhamphornychus, nicknamed Rita. Her brother was fake. Her sister had a knight (her family's traditional custom was to have a knight) named Mikhail Stromenburg. It was revealed that they had a rather good relationship, until the man started doing things she didn't like, including researching and testing on Himaka.