Jewelry Bonney, also known as the “Big Eater”, is a pirate and the captain of the Bonney Pirates. She is one of twelve pirates who are referred to as the Worst Generation. Bonney has eaten a currently unnamed Paramecia-type Devil Fruit that allows her to manipulate the aging process, allowing her to freely make herself and others older or younger.
In Reverie arc, Jewelry Bonney was seen sneaked to Mary Geoise by disguising as a Queen of Sorbet Kingdom. She was seen as having a goal to free Kuma from being a slave to Tenryubito. So, do these people have a mutual relationship?
Bartholomew Kuma once became a feared pirate known as “Kuma the Tyrant”. He was one of the Revolutionary Commander tasked to investigate the World Government until became a Shichibukai. But Kuma lost his memory after he agreed to become Vegapunk’s experiment to become a successful World Government’s biological weapon.
Kuma and Bonney both originate from the Sorbet Kingdom. Kuma once served as the King of Sorbet, because of that, there’s a probability if Bonny is a daughter or wife of Kuma because we still don’t know her exact age is. But I think Bonney is most likely Kuma’s daughter, because she’s a part of the Worst Generation. If her age is older than the Worst Generation’s average age, then she should have been active on the seas since the era before it.
Also, Bonney disguised herself as the Queen Dowager Conney of the Sorbet Kingdom, the same kingdom that Bartholomew Kuma used to be the King of. And going by traditional Oda naming conventions, I wouldn’t doubt it if the real Queen Dowager Conney is a relative of hers considering that she was able to successfully fool the guards and other members of the Navy at the Reverie.
Moreover, in Chapter 1060 we see Luffy saving Bonney from the water. Her being in water should mean her fruit powers are off, putting her in a base form. And in this chapter, we see her as a child.
Lastly, I think that the reason Bonney eats so much (probably she is on Luffy’s level, maybe even higher) is because she is using her Devil Fruit powers everyday, 24/7. This consumes a lot of energy and she needs to always store, otherwise her powers will start to fail, and she will return as a child.