Do I need to provide dinner if my student/guest shows up late?
This is a personal decision. Some parents have a strict rule that if the student or guest does not show up at a certain time for dinner, then they will not provide dinner. Other parents require a phone call from their students to advise that they will be late, and they will set some food aside.
Since you are the parent, it's your choice how to handle this situation, but we recommend that you communicate this rule when you make arrangements with your guests so that there are no surprises.