Who is the sister of Lord Ram?

Yes Lord SriRama has one sister named Shanta. King Dasaratha has got married to Kausalya. Kauusalya is Dasaratha's first wife and she has given birth to a female child with handicap in her leg. The girl named as Shanta. The doctors of entire Kingdom failed to remove the handicap of that girl. One Saint Vasistha has ad viced King Dasaratha by giving adoption to any divine couple the child will be cured. Hence King Dasaratha given the child to Romapada, King of Angadesa. Shanta has cured from the disability due to the treatment and care. She then got married to Rishyasringa (Shringee)Maharishi.
Well after giving adoption Dashratha got married to two more women named Sumitra and Kaikeyi. But all three queens haven't got any children then Dasaratha performed Puthrakameshti Yaga, which given the gift of 4 children named Rama, Laxman, Bharat and Shatragnu to him.