Sameers mom is not Rohans bilogical mother...Thy r step brothers...N tis also xplains Rohan being a headboy cos more or less they wud b less age difference between the duo...n Sams nger may be justified cos his mom must hve deserted him,married n gve all the love n attention to his step bro...n he was all alone left in the boarding!...Tis cud be the reason...