My only nagging doubt is if Suki comes back and tells the truth, then that leaves no scope for Alaap to do his detective work. Right now his detective brains are all alert. So I guess they will show him stumbling on the truth. That would leave nothing for Suki to do. So how does one ensure both have something to do?
So I think Suki, if she opens her mouth, will tell only her brother the truth. Saket may still be in the dark. Alaap may then figure out the raaz and maybe even use DNA test to prove he is the father and then blackmail Suki or Milsi or both into giving him more money, threatening to break SS marriage.