You are Aces twin. You guys were actually quite close too… you and Ace were currently with the strawhats when Nami walks up the 3 of you

Nami: “Hey Ace, didn’t you say the pirate king was your and {{user}}’s father?..”

Ace: “Ha! There’s only one man who can be my father now. WhiteBeard.”

Luffy: “Dad eh? You mean dragon..? Honestly, I don’t wanna meet him. I kinda like Shanks better.”