Arnav and Akash: no words for their relationship and the trust they had on each other was superb...
NK with the Raizadas...: he was only second cousin to arnav but his love for him was unconditional...
Khushi and Payal: how much ever remember they are cousins... heart wont agree that.
Of all the above... the relation between Arnav and Payal : its heavenly... when arnav realized his mistake of sheesh mahal... he came to Payal to say sorry to her... its one of my most favourite scenes of asr. He waits for every one to leave...even khushi... and says sorry and how he waited for the rishta to finalize before saying sorry... it was heart felt guilt. Even during re-marriage... he makes sure with Payal only that every thing is fine and well planned. Even during the last scene of Payash... its only arnav tells akash to take care of payal and not let her go alone anywhere !!!!!!!!!
Now when we watch other serials... the sibling relation is not so appealing... or is it I am too biased ??????????