??GENETIC

    All the Indians know the story of the Ravan from Ramayan..Many may have seen the TV serial from India. I have not seen it but I know it was there. Many know Rava but may not know about his parents. His father was a great sage named Vishrava . His father was also great sage Pulasty  and he was son of Brahma and one of the Saptarhushi. The Vishrava was married to Kaikeshi who was Rakshas family .The marriage between the sage and the rakshasa resulted in children ,one of which was Rava  and other were Kumbhkarna, BIBHISHAN , SHRPANKHA. . The Ravana was the main character in Rmaayan.

   Kumbhakarn was lazy and when he did penance, he asked to be in sleep all the time  and then Ravana asked it to be changed to 6 months awake and 6 months sleep - some say 1 day awake and sleep rest of the days of the year. The BHIBHISHANA was pious  and was on the side of the RAMA  nd advised Ravana not to fight with Rama . Shurpanakha was only sister . Kubera was the half brother of Ravana. 

   So here is the genetic explanation or the explanation based on 3 GUNAS. In Indian philosophy or theology we have 3 Gunas Sattvic, Rajasic  and Tamasic . We all have all 3 Gunas  and depending upon the proportion of the Gunas we have different nature  and behavior. So we have combination od SATWIC from the father who was sage  and Tamasic who was Rakshas. So pure Tamasic child was KUMBHAKARNBIBHISHAN was pure sattvic  and Ravana was combination of TAMASIC . RAJASIC  AND SATVIC .