Everyone's saying that kt cannot be karan and nandani's child because that would seem like she is marrying her cousin (laskshya). But no one remebers that when nandani first entered kyunki she came as the virani's realtive. So in a way she married her cousin too (karan). I'm just saying that anything is possible in a Ekta serial. The chances are pretty high right now that kt is karan and nadani's child.
Also people say that tulsi found kt in the halidwar with that man who said he couldn't afford to keep this daughter. But this could also mean that karan and nandani both wanted their tulsi maa to take care of their child. They could've told that guy to go put kt in the gangajal.
The chances of KT being karan and nandini's child are pretty high.
Sorry if i offended anyone...
Nisha