I don't see what Gayatri did today as making Yash paraya at all. In fact to my eyes, she asserted even more that Yash was apna and Akash paraya, because only those who we truly accept as our own can we take for granted. I know ideally a parent should not choose between two children and favour one or the other but situations do arise when you have no choice, and you have to choose the kid who needs your support the most. Gayatri knows she is taking a risk here, but she also knows that Yash is fiercely loyal to her and she and him have built a relationship over thirty years. She has cultivated the right to his unconditional understanding and the fact that Yash gives it willingly shows this.
It is killing her to do this but her feelings aside, the fact remains that it is unfair that Akash was stripped of everything that should have been his and Yash got it instead. Everyone in Bhopal knows that SP has only three sons and there is no way to say that Akash is legitimate without saying Yash is not. These are all technicalities to Gayatri who loves Yash as her own son, but these technicalities are what are causing the most angst in Akash. In my opinion, Gayatri is being a good parent by removing the cause of Akash's angst first, giving in to all his demands, so they can proceed to build a real relationship with as little baggage as possible. She already has a relationship with Yash and so this is her priority now. I can totally forgive her that and in fact think she is doing the right thing.
Sometimes mothers have to be the bad guys when nobody else wants to take the flak and that is what I see Gayatri doing. Yes, she is favouring Akash over Yash and yes she is calling the son she lovingly raised "najaayaz" but nobody else seems to be willing to take the steps necessary to integrate Akash. Gayatri is doing what must be done for her children, even if it makes her look like the villain of the story. Isn't that what being a parent is all about on some level?
The only thing she hasn't bargained for is Akash's nefarious intentions and the insincerity of his demands. She doesn't know that Akash not only wants his share but wants to humiliate Yash and thereby SP who refuses to acknowledge him. The catch is that SP sees this, and the more he sees Yash suffer, the more he will be pushed to take on the punishment himself. He loves Yash and at some point his tether is going to break and he is going to jump in to save Yash from the pain he is taking on because of SP's refusal to take responsibility. Gayatri can only do so much by herself, especially with Akash threatening to leave. SP has to be the one to "discipline" Akash and teach him how to live with his siblings through his acceptance, just as Yash did with Ansh when he first came to the house. Only when Akash feels unconditional acceptance will he acknowledge the authority of SP, and SP won't accept Akash until he changes himself and plays by the rules of the house. It is a vicious cycle that Gayatri is trying desperately to break.
Seeing Yash hurt and humiliated is what is finally going to make SP proactive, so this phase is very important. During the debate track, Aarti had to side with Palak for obvious reasons, and Ansh did feel the pinch. But what consoled him was learning that he might not have mumma's undivided attention anymore, but that when mumma was busy elsewhere, he could always turn to his papa. Gayatri is doing the same thing here. Just like Aarti had to build a relationship with Palak from scratch and so had to give her priority and snub Ansh, Gayatri is doing the same with Akash. The only difference is that she does not have SP's support the way that Aarti had Yash's and so one child is going to come out feeling unfairly treated and neglected.
Could we blame Aarti then for what she had to do, even though it meant Ansh feeling like his mother wanted him to lose? Can we really blame Gayatri now?