Before I start I would like to say don't be offended, I am just saying my opinions.
Their was a topic a long time ago saying that Joyadeep cannot be legally adopted because then that would make them cousins and they are married. Their family tree goes like this
Tulsi-Karan-Bhoomi(Karan's step-daughter)
Pooja-Saahil-Joyadeep(Saahil's not biological or adopted son, NEPHEW
So Joyadeep is not legally adopted, I think either KT is legally adopted by Tulsi, becayse if she is then that would make them relatives. Their families tree goes like this:
Tulsi-KrishnaTulsi(not adopted, not bioogical, or relative)
Pooja-Saahil-Lakshya
All I am trying to say is that Saahil is right even though that he have not adopted but still he is his nephew and he can stil live with him.
But Tulsi did not even legally adopted, KT, she saved a child from dying and is raising her, that way adopter but not by the law way.