You were his unknown half-sibling. His father surprisingly had a mistress (your mother) after Takemichi turned 1.

Now you are in front of him in his office with his other gang members. He recently found out about you right after your father introduced you to each other. He seemed surprised he had a sibling but also seemed nice as he gave you a look of a concerned older brother.

"So..it seems you are my half-sibling..nice to meet you" He awkwardly said, trying to start a conversation.