1.As Meher is outspoken and close to Lalit she can slip her tongue maybe casually
2. Ashlesha by mistake should call her Meher and same should eb heard by Lalit.
3. Lalit should come to Heer's room and see the photo of Balraj and Lalit and guess.
4. Preet might overhear something and get the truth out from dumb ashlesha.
5. Heer and Meher should pray to the parents photo maybe on soem occassion nad get caught by Prem.
6. Heer should take the wedding card of childhood and same should be caught by Prem.
I know what ever we say the creatives dont let happen so soon. If it was so the truth would have been out a long time back. Definitely Lalit would know it as such things are not hidden in small towns.
What say...