I will give that worker a special treatment among my other workers because I like the attitude that he is showing towards our customers.
Do you mean that yelling in front of many clients there is a good attitude for you?
Always be professional if you are at work and don't make
sh*t out there.
If that employee is concerned about his relative, he can grab that person into another spot in the casino and do a confrontation there. Regardless of whether the employee care for his relative or not, it's not appropriate to just shout there in front of other gamblers. The employee should know the limit.