Kenji is the son of Yumi, who is one of Haruto's aunts. This makes Kenji Haruto's cousin. In relation to Akira, since Yumi is his sibling (sister of Akira), Kenji is Akira's nephew.

Sato is another aunt of Haruto, making her also Haruto's father's sister. Therefore, Sato is Akira's sister. Hina is Sato's daughter; thus, she is Haruto's cousin. From Akira's perspective, since Sato is his sister and Hina is her daughter, Hina is Akira's niece.

Hina is not Akira's daughter because she is the child of Sato, who has been established as Akira's sister. If Akira had a daughter, Hina's relationship to Sato would be as Sato's niece, not her daughter. Therefore, Hina cannot be Akira's daughter.
Akira is Haruto's father, and Haruto has two aunts, Yumi and Sato. Yumi has a son named Kenji and Sato has a daughter named Hina. Describe how Kenji and Sato might be related to Akira and Haruto, respectively. Additionally, why isn't Hina Akira's daughter?

Respond very briefly.