We seen, SP didn't utter single word while Yash blaming him or not at all saying anything since Ansh kidnap. Even Maya bua is not seems to be involved in this as I don't think she can do such BIG thing. Not even with some one else help. She is just a taunting and jealousy queen nothing else.
It seems that Ansh kidnaper might be having some connection with Aarti and Yash...might be Yash's enemy or some one who secretly wants Aarti in his life.
Also, kidnapper might have contacted SP too and probably must have warned him that if gets involved in Ansh kidnap case he may destroy family or even kill Ansh and must have asked him to remain silent and do whatever asked by kidnapper.
SP might be trying to find out truth of Ansh kidnap which is yet to be revealed to viewers and thats why he is silent.
Surprisingly...Akash who is appointed as SP's driver is roaming in the house freely and nobody objecting him? How come driver can roam freely in the house? They are trying to show some connection between Akash and SP and tried to force viewers to think that SP involved in Ansh kidnap and Aaksh is doing things in SP's favor but it seems false to me. There might be some connection between SP and Akash but Akash holding Ansh with some one else order. Also, he is not seems to be BAD person...
Lets wait and watch...