“Somehow, I’m not sure how, it’s been ingrained in our kids to let us know where they are.”
This is de facto in our house. And, when children watch their parents adhere to this, they learn. I explained one time that we always tell others where we are going (and not just one person because that one person might leave and forget to pass the message). It’s not to micromanage but it’s just a courtesy in case someone needs you. Even in my office, we just tell others when we’re stepping out for a few minutes.