It really does not matter what Sai tell him
if Vinayak knows that sai is his mother .. then it will be difficult for him to accept that virat is the father .. especially if the truth has not been given to Savi
If Sai gives up Vinayak to patralekha n virat then we are rest assured they have planned another hero for Sai .. who will be the adoptive father to Savi
Because accepting Sai as mother also means accepting Savi as sister ..he is showing more attachments to them than Chavan family
3