This is what is said in the cast page on this forum, which indicate that Anoop may be a cousin to Sahil:
Anup is a loner and an introvert, he doesn''t open easily with anyone except with Netra, his cousin sister. He was sent by his mother to her maternal uncle where he got educated and finally managed to become a pilot because he loves flying, above the crowded world of his joint family where he got unfair treatment by his Badi Ma Raj Laxmi who always denied him the same advantage that she gave to her own children Bhushan, Sahil and Netra. All because his own father Gautam was a loser and a failure. He would have left the joint and lived away with his mother if he could, but Manjula did not want to break the joint family. His relationship with Mansi is uncomfortable and awkward because he had lived most of his life alone and even while working, he rarely came home and stayed in hotels more often. He has been an outsider to his joint family.