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Yeah , back then I thought I knew everything about gambling but now that I totally understand the importance of professionals I kept telling my Addicted Cousin to try consulting or seeking Help from a clinic.
though up to now he kept denying yet I will not stop to ask Him and help him get through this problem.
Go to the professional yourself and ask questions on your cousin's behalf. Tell him how often he gambles and how much he loses, how does he feel in general and other stuff that the pro professional will ask you about. He will make a conclusion and you'll see how severe the condition is. And then, in a relaxed atmosphere, tell about it to your cousin. Convince him to go to the professional himself. All of this might not work, but at least you'll try.