The Rosewald family were aristocratic German ghouls and a branch of the Tsukiyama line. Wiped out by the investigator Matsuri Washuu more than a decade before the story, they survive only through Kanae, the sole child to escape the slaughter.
The Rosewald family, Rozevaruto ke in Japanese, were high-born ghouls who wielded notable standing in Germany. Their name translates from German as forest of roses, and the von prefix marks their noble rank.
Their fortunes ended when Matsuri Washuu hunted them down, an operation carried out more than ten years before the main events that won him sizable acclaim. The bloodline links into the Tsukiyama family through Tsukuru Tsukiyama, who fathered a child with a Rosewald in Germany; that child went on to parent Kanae, so Tsukuru stands as her grandfather and the Rosewalds count as a Tsukiyama branch. Only Karren lived through the massacre. At nine she fled to Japan, where the Tsukiyamas took her on as a servant, and to keep a vow to her kin she disguised herself as a boy and adopted the name Kanae.
The family tree runs from Tsukuru Tsukiyama, Kanae's grandfather, down through her parents, including her mother Emma von Rosewald, and her two elder brothers Arunolt and Nathanael von Rosewald, ending with Kanae von Rosewald, the youngest child and lone survivor.

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The Rosewald family were aristocratic German ghouls and a branch of the Tsukiyama line. They were wiped out by investigator Matsuri Washuu more than a decade before the main story, and only Kanae survived the slaughter.
Yes, Kanae is related to the Tsukiyama family. Tsukuru Tsukiyama fathered a child with a Rosewald in Germany, and that child later parented Kanae, making Tsukuru her grandfather and the Rosewalds a branch of the Tsukiyama line.
Kanae fled to Japan at age nine after the rest of her family was killed. The Tsukiyamas took her in as a servant, and to honor a vow to her kin she disguised herself as a boy and took the name Kanae.
Rosewald translates from German as forest of roses, and the von prefix in the family's full name marks their noble rank as high born ghouls in Germany.
The Rosewald family included Tsukuru Tsukiyama as Kanae's grandfather, her mother Emma von Rosewald, her elder brothers Arunolt and Nathanael von Rosewald, and Kanae von Rosewald herself as the youngest child and sole survivor.
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