To see Vinu gain his trust back on Sai, I would personally want him to witness her as "Doctor Sai Joshi" again. Vinu is always inspired by Sai's doctor aunty roop. He wanted to grow up to be a doctor just like her. But he has suddenly flipped into this whole Sai is evil jadugarni and is out to snatch me away waala zone. But to snap him back he needs to see Sai in her saviour, protector avatar. So someone needs to be seriously ill in front of him and he needs to see Sai as the one curing him/her with her healing touch and that should give him some recall about how it was Sai that saved Ps life also. If she wanted to snatch him, she could have easily allowed P to die. Similarly it was Sai who saved Vs life in Kankauli too. It'd be a lot more engaging if they focused on Savi-Vinu talking about Sai or Vinu actually being forced to reconsider his opinion by thinking about all that she has done not just for him but for others. He can overhear Savi raving about her superwoman aai, K talk about how Sai helped her when she was in danger (had miscarriage) and took care of her, BK saying- ki P or V ki jaan bhi Sai ne hi bachayi thi.
Vinu and Savi have been potrayed as smart kids so it looks off that they arent asking too many questions about things. Savi even after seeing P as Vs wife hasnt asked about why he is married to another woman if he was married to her aai first. she hasnt even asked V why he hid the truth. she asked Sai but then assumed that Sai also had some pinki promise she couldnt break...
Vinu was barely there in episode and he didnt say anything new despite getting new info from Savi. He heard from Savi that Savi is real sister and V is his real baba but his focus is more on Sai living in CN. why?! How is it that he only doubts Sai and not savi....Its really illogical. Shouldnt his first reaction just as he asked Savi - aisa kaise ho sakta hai- to go ask V and P the same thing. How come V is his real baba. and if he is, why didnt he tell him all these days.
I get that they want to prolong the track. but they can show him atleast start thinking about other facets.
Having Vinu keep on repeating the same line- She will take me away and cry and P smother him and say- see Vinu is so disturbed because of Sai- that has been stretched like a chewing gum now.
They need to move on now. Ek hi dialogue baar baar kab tak bulvayenge

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