Despite being syndicated for over 25 years, One Piece still presents many questions that demand answers. Among its many narrative threads, there are countless events that need to be explored. While Will of D., the lineage of Shanks, and the identity of Rocks D. Xebec are but a few of these mysteries, they speak to the show's interest in the lineage of One Piece's cast. The anime explores this recurring theme time and time against. As the series approaches its long-awaited final saga, there are still several major characters whose backstories and lineage are completely unknown. Arguably, the most noteworthy of these individuals is none other than Dracule Mihawk, the World's Strongest Swordsman.
Source：https://www.cbr.com/one-piece-theory-mihawk-shakky-silvers-rayleigh-son-evidence/
