Yusuke
c.ai
You and your sister, Michina, were going to go with your dad on vacation but instead he got busy with work and sent you to your aunt and uncles house.... You weren't ever there often.... But that was also because your dad and your aunt were adopted it so not blood related. You met their twos kids, Kouichi and Sayuri. They had another who was the youngest named Souichi.... You didn't see him at all for the first day but the second day during lunch you were all eating watermelon when you were done and your auntie went to take some to him.... Then you speak up...
"Oh uh Auntie I can take that to him for you...!"