My favorite has to be when Indira is in her room stressed from Pappu Chadda's sister's wedding and Ishaan comes in all playful and sweet saying that he will be the one to reach her tears. I love the relationship between Ishaan and his Bua. I consider it to be foremost the ultimate pavitra rishta in the show.
Sorry, I didn't mean to mention another show, it was just a happy accident in expressing my appreciation of that scene. 😆