After watching the character of Rudra's uncle, his wife Mohini and their house it seems that past of Rudra is not as simple as it appeared initially. From the flashback (when Rudra brought Paro to their house), it seems Rudra was a mama's boy. He was thinking about the moments he spent with his mother. And suddenly one day his mother disappeared. Rudra's father thought that she eloped with someone. But young Rudra had belief that his mother will be back to house. thats why he did not want to leave the house with his father. It was Mohini who poisoned Rudra's mind initially against his mother.
Somehow I feel that Rudra's mother did not elope with someone. Probably she left the house for the sake of her husband and son. And this fact probably Mohini (Rudra's mashi) knows very well.
CV did not bring for nothing Paro to Rudra's house. She will definitely discover the past of Rudra what Rudra even does not know. I think, Rudra's mother will be back and Paro will bring her.