2

Kumbhakarna had two sons, Kumbha and Nikumbha, from his wife Vajramala who too fought in the war against Rama and were killed.

3

First of all Bali's daughter was not married to Ravana's brother Kumbhakarna (at least as per Valmiki Ramayana). Please see this shloka from UTTARA KANDA of Valmiki Ramayana:

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Virochana was Bali's father. As shloka says Dohitri and not Pautri, this is the correct translation:

Ravana married the grand daughter of Virochana (on the maternal side) named Vajrajwala, to Kumbhakarna. (English translation source)


Ravana visited Rasatala to release Bali from the bonds (which Ravana thought due to his ignorance). But Bali, the greatest devotee of Lord Vishnu refused. Also, Bali explained him the greatness of Lord Vishnu. Ravana was humiliated there as he couldn't lift a celestial kundala which Bali asked him to lift in order to test Ravana's powers. So their thoughts were completely different. Few scholars might have treated them as enemies due to this.

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[king Bali]: O Ten necked lord of Rakshasas, O thou having long arms, what desire of thine may I satisfy? Do thou tell me what for thou hast come hither.

Being thus addressed by Bali Ravana said I have heard, O illustrious sir, that formerly thou wast bound by Vishnu.

Forsooth I am capable of releasing thee from the bonds. Hearing that Bali laughed and said Hear, I shall relate to thee what hast asked, O Ravana. (English translation source)


The complete story of the conflict between Ravana and king Bali is given here.


Footnotes:

As per Vishnu Purana - Part 5 - Chapter 35, Lord Krishna's son Śámba was married to daughter of Duryodhana. But still Lord Krishna and Duryodhana were not friends. So it's not necessary that relatives have to be friends only.

  • Then WHO WAS Vajrajwala? Was she not related to Bali at all? Are him and Ravan not in-laws? – Knowledge Seeker Jan 28 '18 at 16:00
  • @ThePhone999 She was related to Bali..Either Bali's sister's daughter OR Bali's daughter's daughter as shloka says Virochana's Dohitri... – YDS Jan 28 '18 at 16:09

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