Was kuma ever the king of the sobert kingdom
Seems to be in the last 5-10 years. This is just an assumption, but 14 years ago he and Ginny were RA commanders. I assume Bonney is their daughter at 13.
At some point 12 years ago (when Luffy's FB occurs), he and Dragon rescue Sabo. Sabo seems to be acquainted with Kuma so I assume he and Ginny had some years under their belt. Maybe Ginny leaves for Sorbet after having Bonney, secretly.
My guess is between 5-10 years ago, Kuma returns to Sorbet to protect it with Ginny. Bonney looks very young in 1063, so I would put her around 4 or 5.
Then Ginny dies and its just them. Eventually he is accused of being a Tyrant, forced to become a Pirate, then captured and becomes a Shichibukai. All of this, Bonney would be with him as a child, because she knows VP, Sentoumaru and Kizaru.
I assume 1098/1099 will explain this timeline fully