When did he get to know?

Today maharaj said that sitara shouldn't get to know that she herself is a vishkanya. When did he get to know this? They never showed him finding out, unless guruji told him but us audience just weren't shown. That's a big thing to not show the audience. They waste screen space on some unnecessary scenes, but yet didn't show us a scene where the king is told that sitara is a vishkanya, which is a significant thing. 

I know. I thought it was only guruji and her father knew about this.

Even I was wondering the same. Or Ratan Singh knew when Sitaara was born and Kuldeep may have told The two RajGuru & Kuldeep knew but Maybe RajGuru took Ratan into telling since Kuldeep had a sowrd on his head with being Sitaaras father.

All these three have hidden the identity from all about Sitaara & the Vishkanya.

Yamini knows there exists Vishkanya
But the main person Ciraaj when he knows Sitaara is one how will that be handleed will be interesting.

Now the two snakes one with mata Rani's blessings & the other with real Vish they will test on Viraaj or fight themselves to go away