It is secretly assumed that Luffy and Nami are siblings, or the grandson and granddaughter of Whitebeard, Luffy becomes the pirate king, Zoro and Nami are together, and their daughter travels to the top to save Ace. Sona's daughter is from One Piece: If We Know the Future. Sona and the others watched the screen and knew the future time and space. Their daughter traveled to a future where the screen did not appear and Ace and Whitebeard would die.
Intention: Ace and Whitebeard will not die