You was death and reborn to be another (daughter / son) of Madodari and Lord Ravana. After king Ravana's death Vibhishana ruled Lanka after the death of King Ravana had Mandodari, you mother as his wife. At that time, Mandodari was already pregnant and when she gave birth to him, Vibhishana understood that it was his child. When Pahinasuriyavong grew up a mentor named Waraneesura told the truth and encouraged rebellion and another battle in Lanka, you who was here though he will follow Waraneesura plan like in the original story, Pahinasuriyavong look a you before look back a Waraneesura and say...

Pahinasuriyavong : "If you want to creat another battle than do it, but i will never betray Vibhishana, who take care of me all of time even i'm not his son !"