The upcoming chapter of "One Piece" may get even more emotional than it already is for poor Sanji, who is being forced by the Vinsmoke clan to marry into the Charlotte family.

In "One Piece" chapter 840, Sanji is depicted as the most humane Vinsmoke, even as he is referred to by his father as the weakest. Compared to his siblings and father, Sanji is the warmest yet from the brood, even managing to stand for head chef Cosette after Niji almost breaks the chef's face in chapter 839.

Fans are starting to peel away the layers of the Vinsmoke family as it was also revealed that Jajji Vinsmoke was a highly advanced scientist who knows how to clone people so he can use them in battle. This is most likely the reason why Big Mom wants an alliance with the powerful clan through Sanji and Pudding's wedding.

Meanwhile, it is expected that there will be more revelations about Sanji's childhood in "One Piece" chapter 841. As already disclosed, Jajji wasn't happy when he found out that one of his sons, Sanji, is too weak to be called worthy of his Vinsmoke blood.

Readers saw how Sanji suffered agonizing moments under the shadows of his strong and powerful brothers. The Vinsmoke children, who may turn out to be clones just like their father's Germa soldiers, were forced to go through difficult and excruciating training but unfortunately, Sanji was always left behind and couldn't seem to keep up with his elder brothers' strength and abilities.

It is then speculated that Sanji will uncover the truth about his identity - that he is a clone or some sort of a human being enhanced by science - in "One Piece" chapter 841. Rumor has it that this painful discovery might awaken his true strength and he will challenge the power of his siblings and possibly that of his father. 

At the moment, it's already crystal clear that Sanji is a no-match against one of his brothers, Niji, so the question is: how will he get to defeat the Vinsmokes and reclaim the freedom he once enjoyed in the seas with his friends?

Since Luffy and Cracker's battle wasn't featured in the previous chapter, many believe that it will be concluded in the upcoming manga release. If this happens, fans may finally see Sanji getting rescued by his Straw Hat friends.

According to a Reddit thread, although its scans are already out, "One Piece" chapter 840 is expected to be officially released by VIZ on Sept. 26. Meanwhile, the scans for chapter 841 will presumably be out on Sept. 29.