I think it was a joke...
that's why I said ''plot twist'' .. happy ending for everyone xd but ofc I know it wont happend because if it would be so predictable no one would love one piece as we do now.
My honest theory is that Pudding is the girl with 3 eyes because they paid alot of attention to her as if she would be of importance in the future. Lola and probably Bonney are her sisters. I heard that in the original translation it's said Pudding is 3rd doughter. Also the bounty for the castle man is 300,000 beli. But im not 100% sure about these information as I cant read Japanese its just something I watched on youtube.

Plot twist: Nami is actually the 35th doughter of the charlotte family, pudding xd Sanjis dream come true and Namis dream(money) aswell