Well, essentially, great powers do not engage in lord of the ring style brotherhoods because their interests overlap with more than a few geographies or regimes. In this case, China will surely develop relations with both Pakistan and India; it is simply stupid to close down one side for the sake of the other.
International politics is neither a charity nor involves altruistic moral concerns.
I am for good relations and deeper economic cooperation with India. Why not, they need investment, and China needs to invest to explore additional markets in order to complete the economic transition.
Terms like friend, brother and others are just too gross for IR.