If I'm the casino owner I wouldn't fire that casino working knowing that the gambler has some serious gambling problems and the worker is the newphew of that gambler. I would resort in humanitarian ways than a greedy casino owner. Also, There could be a negative possible tendency that the gambler might do like taking his own life because of the financial problem he is facing + family responsibilities he don't commit, Surely this will have an impact to the casino especially if this came out on media. This way you don't do unjust with your workers and you avoided future problems in your business. It's the workers family that knows the internal problem with that gambler, It's not a random dude just keep losing. You should be just considerate with the workers action.