“However, if I heard my neighbor yelling “what are you doing with that knife” or “put that gun away”, I don’t think I would hesitate to call the police.”
What if one of the family members is writing a play, and the other family members are helping by acting out the scenes?
On a more practical note, how about knocking on the door to ask to borrow a cup of flour or something when you hear the loud voices? Then you could assess whether there’s a real problem. If that seems dangerous to you, find a big mean-looking friend to do it for you.