Naksh is used to the touch and feel of his parents so wen he gets a sense they are not around him he will cry. A 4 month old baby knws who his mother his and who is father is just by their touch.
Wen mama and mamiji sed they dont i was just outraged by it as how can they say such a disgusting and heartless thing! In the episode u can see and Gay3 even sed it that duggu is used to akshara's touch and motherly love as soon as she sat with him duggu was quiet.
Also wen naitik came naksh recognised him too and in yesterdays epi duggu was smiling to his papa as he knws who his parents are!! ;-)
I hope mama and mamiji get wat they deserve in getting kicked out of SS mansion as well as Bhabhimaa get the extreme cold shoulder from her family for taking those 2 idiots words seriously.
The 3 idiots were the limit today and cant wait for them threes intention to become known in front of everyone and they get loads of jhoote and chappals (& maybe belt too! :-D )