Right from the first scene of Anuj and Samar, where he sees him walking on the road he notices him crying. We all need a benign soul that cares for us unconditionally, anuj is that to Samar. P1 thinks the saving of Samar was orchestrated as his role models thrive on manipulation and humiliating others.
Kinjal craved for a mother figure that cared and pampered her. A benign presence sensing her moods and needs. Anupama has been that.
Samar always felt his mom deserved respect and appreciation which she never got. Anyone that treats her well will be adored by the kid, in his case it's not about what he will derive by supporting his Anuj. It is about how he makes him feel.
Anupama tries to be warm and kind to all. Samar too has that quality. Anuj too tries his best to be nice to others. He can be that friend, philosopher , guide the GK to Samar.
Samar has repeatedly told Mr Shah that he would long fir Samar to call him Papa. Even after the accident it is Samar and Anupama that tended to Vanrajs needs and not the favoured children of his.
By the disparity shown in treating his children, Vanraj has excluded himself from his life. Samar calls his Dadaji COOL DUDE. He calls Bhailu MAMA BUDDY. I'm sure in time he will have a fond tag for Anuj too. I'm sure it won't be Mama oe uncle.