@Sammy...
Actually, I only saw a mother figure in the drawing that was absent before but present now. I ascribed neither Arpita nor Aarti to the figure in the drawing since that might have been too presumptuous. In my mind, this appearance of the mother figure in the drawing coincided with the appearance of Aarti in her life.
I disagree though that Palak's need was created only by seeing Aarti as a mother to Ansh. I think it is inspired (that's what it was, in my mind-an inspiration) by Aarti's behavior with all the 3 kids. Aarti feeds all three of them, tells stories to all of them (unlike G3 who has sloka sessions only for her bachchiyaan), and specifically for the girls, she combs their hair (how can we forget this?), makes their favorite sabudana kichdi, and so on. Even if Palak is resistant and rude in the face of another's questioning (just like Yash), she accepts these ministrations and care as part of her daily routine. And Palak cannot have missed that Aarti doesn't back down and show any ill-feelings, no matter how rude Palak is. It is this unbiased consistency and stability that Aarti has brought in their lives that has created this feeling of a complete family in Palak's mind.
And this feeling of a mother figure around her, taking care of her needs albeit in a physical manifestation is probably what inspired that family picture. If I recall correctly, Palak is happy when she brings this drawing to her Papa, looking for his approval. And when she says that no letter needed be written and so on, I felt that she was not really missing Arpita. (This would be substantiated by Aarti's reactions as I mentioned in my take). And only when she doesn't get a response of approval from her Dad, does she begin to get upset and turns away, thinking she did wrong. And then Aarti comes rushing and pushes herself on her. And then the overt feelings, all the G3/Bua profound teachings, and her insecurities etc. everything floods to the fore. Hence, her harsh reaction to Aarti and her running to her old refuge-her papa. I thought it was at that point she exhorts her Papa to bring back her mother.
And Yash, in those few moments of stunned silence, negated all the progress that Aarti had made in her relationship with Palak. Yash's cluelessness around kids is a given. But in this instance, his being stunned could be forgiven, since Palak's questions have driven him to examine his own conscience and feelings. This is what I said about his situation. "A turning point for Yash... If he said yes, he would be acknowledging that he is moving on which, to him, on the surface would be a falsehood, yet underneath a growing truth; and if he said no, he would certainly be acting as a deterrent or even preventing Palak from moving on." But even without saying no and by being silent, he managed to achieve the latter.
EDIT: P.S. If the episodes are all like this one, then I have to put my sarcasm and my funny bone in the freezer. I am not sure which I'd prefer..??!😕 😊