With kindest personal regards, Kitt
I am sorry you are dealing with a difficult employee. As the supervisor you must learn to engage this person and not let the behavior continue. In my experience responding to a difficult employee in a calm and rational manner has served me well. Remember when you attritube a positive trait to an employee, the person is more likely to start acting that way regularly. Be sure to follow through after addressing the issues to make sure the employee understands your expectations. If not revisit the problems and expectations and perhaps even put the expectations in writing.
I like your idea of setting aside an evening once a week just for you. Please do it and make sure nothing other then an emergency keeps you from your special time.
Take care and gentle hugs,