I think.... "Khemi is Kanji Waghela and Moti Ben's daugther. Only Shakuntala (who is no more) Nanaji (Kanji Waghela's father) and Jhamku know this secret. Not even Motiben.
Moti ben who herself is a manglik does not get a suitable groom. So she insists that Nanka and Shakuntala who are in love should get married first, though she is elder to Nanka.
Later she falls in love with Kanji Waghela during some dance shows and they decide to get married. Kanji promises to pick her up from her house but never comes back. He gets killed and Moti ben thinks that he cheated her - the main reason for her hatred towards "chote log".
By then Moti ben is pregnant. Shankuntala keeps her in a secret place and after the baby is delivered, Shakuntala passes the new born Khemi to Nanaji through Jhamku who is her trusted aide. The baby shifting happens while Moti ben is unconsciousness and she gets to know from Shakuntala that she had a dead child.
Later when Moulik is borne to Shakuntala, she offers Moulik to Moti ben and says that he will be raised as Moti ben's son. That is the reason for her strong emotions towards him.
Santo & Mongi are Nanaji's daughter's children and Khemi is Nanaji's son's child. Having the same sir name is no big deal - like Sania Mirza is getting to Sohrab Mirza. So this twist should make all lines clear for Hiten and Khemi's love".