They will brew trouble in the lives of protagonists Yash and Aarti, essayed by actors Gurmeet Chaudhary and Kratika Sengar, respectively.
In the upcoming track of the show, Yash will find himself being forced to divorce Aarti and marry another woman to save little Ansh.
Heena will step in to play the character of Ishita, the handicapped girl whom Yash is forced to marry, while Dolly will be seen in the role of a mother to drive Aakash.
"I am delighted to be cast as Ishita in 'Punarvivaah'. It is a pleasure to work with talented and established actors like Gurmeet and Kratika. My role, though that of a handicapped girl, will emerge to have shades of grey eventually. It is a challenge I am looking forward to," Heena said in a statement.
Dolly admits she plays a "somewhat negative role".
"But to call my character a villain would be pushing the truth. I believe that my character is only fulfiling her duties as a mother... I can't wait to see how my character develops on screen and am looking forward to this new role," said Dolly.
The show airs on Zee TV.