Counsellor
This is not something that can be overcome quickly especially if he is in denial that he has a problem. Unless he admits he has a problem then there is not much you can do.
His wife could limit his access to money and give him an allowance.
He probably will not see a counsellor but she could and they can give her some tips and hints.
Google Gambling counsellors and you will find one near to you - they are free to see.
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