In NJ, abused children have DYFS to intervene on their behalf. Sadly, because of the absence of strict laws protecting animals, abused/neglected cats and dogs don't have much if any recourse. Maybe your bro can have him neutered and keep him indoors. Hopefully his spraying will cease upon neutering. That is what I would certainly attempt to do for this poor, obviously mistreated and unwanted feline. As for the so-called "owner", I can't type what he deserves or I will surely be censored.