YEs i think this may happen that Armaan is son of Dr. Rahul Or Dr. Juhi..
Act while visiting old topics I found n article posted by one of the DMG fan where Karan says that Dr. Armaan is a son of A doctor.HEre's the link
https://www.indiaforums.com/forum/dill-mill-gaye/710664/karan-loses-his-heart-2-a-young-intern
Another thing that is in sm other articleor smwhere i read that Dr. Juhi will also rejoin Sanjeevni?????i dont have that article...but i think Armaan is Son of Dr. Rahul and Dr. simran .....