Kenji and Daichi are the sons of Akiko, who is a sibling of Hiroshi. This makes Kenji and Daichi the first cousins of Hiroshi's children, Kaito and Naoki. Similarly, Emiko is the daughter of Yuko, another sibling of Hiroshi, making her also a first cousin to Kaito and Naoki.

Satoshi is a sibling to Hiroshi as well, but the question does not specify if Satoshi has any children. Regardless, Satoshi is the uncle to Hiroshi's children, Kaito and Naoki, since he is Hiroshi's brother. Kaito and Naoki would be nephews to Satoshi.
Kaito is the brother of Naoki. Their father, Hiroshi, has three siblings: Akiko, Satoshi, and Yuko. Akiko has two sons, Kenji and Daichi. Yuko has one child, a daughter named Emiko. How are Kenji and Emiko related to Kaito and Naoki, and what is the relationship between Satoshi and Hiroshi's children? Provide a very brief response.