If you were the casino manager would you fire the casino worker for interfering with your business or would you ban the gambler from visiting the casino?
Not totally fired but maybe just give a warning and make sure that won't happen again.
Casino employees shouldn't act that way as they have nothing to do with the gamblers there regardless if they are family, friends, or close ones. These employees should just do what they are supposed to do inside the vicinity of that casino. Yelling at a gambler for that reason is not appropriate.
If that employee, that turned out to be his nephew, really likes to put an end to his beloved family gambling activity, they can settle it all in their home, not inside the casino where it's not the employee's role, to begin with.
And also it do really affects out overall appearance of the casino when those yelling did really happen on the place which is a bit scandalous talking about yelling which isnt that appealing but if it done on a simple whisper or talk then its considerable but if it do really poke up some attention around then thats totally not something a good thing to be done.
Firing the worker wont really be that justfiable though but it wouldnt be bad if you do give out warning on his first offense and not make out harsh conclusions or decision just because of that mistake.
A little bit consideration for such situation but if it did really happen on second time around then thats the time you do make out such decision but for now give him/here a warning
first on whats been done.