Akash has a lot of psychological issues.
Gayatri is not equipped to handle children with issues.
First and foremost Akash needs a father. If G3 was smart she would use her current power over SP to insist that he accept Akaash. But she is responding by ignoring SP and giving him the silent treatment and making a show (drama queen act) that she is the sole parent who cares for Akaash. And treating Akaash in her habitual way of infantilzing the said (adult) child and giving in to his whim and fancies as an indication of her love. In fact at times G3's attitude towards SP comes across overtly hostile - in a way (demeaningly) challenging him to accept Akaash. If only she would approach SP in a more mature, nicer way by being a bigger person!
Secondly he needs a counselor, a mentor, some to befriend him and guide him through the intracies of the new lifestyle and joint family system that is his. In all of this his primary need is that of a behavior modification therapist. Neither SP nor G3 believe in counselling, mentoring or seeking professional help to assist their children deal with life's problems.
Thirdly at this point G3 and SP themselves are need of a marriage counselor and a therapist help them navigate the crisis they are facing. It could be a professional or a trusted older adult/relative.
Fourthly the 2Ps and their wives too need help to cope with this revelation of their father's hidden secret.
The CVs have not given any lines to Radha so her silence is omnious. Although thus far it does seem that all plotting is being done by Ishy and Akshy with Radha having no role in it.
G3 is facing life situation way above her what her coping strategies are meant to handle. So G3 is relying on the love Yash must know she has for him to understand her. Her understanding of Yash's nature has not proved wrong - he rose up to the occassion and accepted to fulfil the promise that G3 gave Akaash. Yash has no resentment or ill will toward G3 nor does he feel cornered by G3.
Yash does not hold ill will towards Radha. He had no say in how his life unfolded until this point. But now he has the opportunity to payback for the crime that his mother unknownst to him committed on G3 and Akaash.
Yash has taken this up on his own for Yash this is a God given opportunity to redeem himself from the unwitting misery he inflicted on Radha and SP by taking birth in Radha's womb and later by enjoying the comforts of G3's upbringing in SM.
Yash has no ill will towards Akaash but Akaash's rude behavior towards him, Aarti & his kids will make it difficult for Yash to harbor any feelings of affection towards him.