Part of my daily job involves being the Unit Training Officer. Part of that responsibility involves training my folks on safety issues every year in preparation of fire season. And one of the issues that shows up in every single accident with injury and/or fatality is a communication problem of one kind or another, usually several or more problems.
Personal example: One day a group of us were out in the desert training in shooting scenarios. We set-up a scenario and I made the announcement multiple times that it would be a “dry run”, “no live fire”, “practice only” for the first run through. So we are ½ of the way into it and shots ring out. I holler “freeze”, look around and here is my buddy with his barrel smoking. He was looking at me like “What?” He later admitted he had heard what I said but it didn’t register. After that we did a “weapons check” and “buddy check” from that point forward.
Your family/group/team needs to understand each other, both verbal and non-verbal communication. You have to be able to communicate. Use radios, sign language, common language terms…something, anything. The important thing is to communicate; practice it, training with it, and make it second nature before you need it. Communicate!