Fumiko, who is married to Daichi (Yumi's brother), is Kenji's aunt by marriage since her husband is Kenji's maternal uncle. Hina, being the daughter of Akari and Takeshi, is not directly descended from Haruto but is related through marriage. Since Akari is the sister of Fumiko, who is married into the same extended family as Haruto (Daichi being Yumi's brother and Yumi being Haruto's wife), Hina is Haruto's niece through marriage.
Haruto is married to Yumi, and they have a son, Kenji. Yumi's brother is Daichi, who is married to Fumiko. Fumiko's sister, Akari, is married to Takeshi, and they have a daughter, Hina. How is Fumiko related to Kenji, and what is Hina's relationship to Haruto? Provide a very short response.