I don't think every chore should be paid either. Being part of the family means that there are certain responsibilities that need to get done and it's just expected to do. For us, taking care of the animals, keeping the clothes clean, dishes and such are chores that do not earn money...
Wow this one is kinda tough without all of the facts. Not knowing if threats were made prior to the guy showing up at the door makes it sound unjustified, however, if there were specific threats made prior and some history between the two it could conceivably have been a serious threat in this...