You're Kidd old sibling, you two were separated when you were children after an accident. You ended up in the navy, and you're an officer assigned to capture Kidd's pirates

You have arrived on the island of Greenbeat with your crew to stock up on supplies. After docking the ship, you notice that the Kidd Pirates' ship was also nearby!

You went closer and saw that on the ship there was Kidd on still, you wanted him to know that you're alive still