Who is Diya's father?

I mean.. I see only Ashok Tandon a man in that house.. reading wiki I understood that Prachi sees him as a father figure and fake married his son. 

And Ranbhir became fake fake bayfried of his daughter Mihika.

Mihika is in mental asylum her brother died. etc.. etc..

Divya is Ashok's sister's daughter... Diya is Divya's daughter.. but who is the father.. and is he dead? are they divorced? why is no one talking about him?

Haha even in previous generation no one knew who shaahna's parents were. She was just living with prachi and pragya then. And no one knows what happened to the son of purab and disha and then later the son of purab and Alia and just whatever happened to purab and that side of the family. The show is not really known for its cohesive story or plot.

I have a feeling that RV elder sister married a brute who did not allow her to attend wedding 

and that brute man is related to Purvi and Prachi or ranbir only 

I feel hes either Aliya son or Mishika son or Akshay son etc 

Hold on i truly think RV sister hubby is kept mystery as RV sister married into Pranbir family or Mishika akshay family 

RV is in for shock