'Rahu - Ketu' or Swarbhanu

 

Rahu Dev: Head of Demon Snake,

Ketu Dev: Tail of Demon Snake

  There was a Asura named Svarbhanu , who drank the nectar and Lord Vishnu cut the head of the Asura. The head part was known as Rahu and the body got known as Ketu.

Svarbhanu’s parents -

Father - Viprachitti

Mother - Simhika

There are many theories about the parents of the Simhika. Three of them are as follows :

 Theory 1 -

Simhika was the daughter of the Hiranyakashyap   and sister of the Bhakta Prahlad.

Simhika got the boon from Brahma that she can control anyone's shadow. Later, she controlled Devi Chhaya, mother of Lord Shani and wife of Surya, the sun god. And eventually got defeated by Shani and Hanuman. Simhika was forgiven by monkey god, Hanuman, but Hanuman told her that whenever he finds her in later phase of life he'll kill her. Later, when Hanuman was climbing the ocean to Lanka, the kingdom of Demon Ravana, Simhika was hiding in the ocean and captured Hanuman's shadow, Hanuman jumped into her mouth and came out tearing her stomach, ending the life of Simhika.

Theory 2 -

Simhika was the daughter of the Diti/ Chhaya and Prajapati Kashyap. This theory says that Simhika was the sister of Hiranyakashyap.

Theory 3 -

Simhika was the daughter of the Daksha . It makes her the sister of the Sati.

Source : Wikipedia