I'm not trying to promote all to purchase fireproof and nuclear ground zero proof safes but it all starts with a routine and practice. Now, several agencies have recommended procedures for securing their issued weapons. Your academy or range master will have suggested procedures for firearms and other instrument safety. Confer with them for their recommendations and suggestions; they are your local experts. Don't forget the OC spray, electric control devices, utility knives and portable radios.
Once you have your safety plan adopted, stick to it and follow it religiously. You lay down for a power nap prior to a night shift. You've left the service weapon out and little inquisitive eyes take a gander. We could have a tragedy.
Follow your safety rules, no exceptions. This is also a tactical advantage for the home defense. If you have the weapons placed where you know they should be, you'll be prepared — no frantic searching for a weapon. If things go bump in the night, you'll instinctively know where to grab and how to respond.
Whether you have a safe and secure place, utilize gun locks, safe boxes or hidden compartments, you must have the family meeting. You need to tell each and every dweller with you the rules and allow no compromise. A special note for parents — as your wee ones mature, you may have to meet repeatedly for their interests and self-discipline can change or waiver. Make certain you have house rules.
Another added bonus is to have your spouse/significant other take a firearm safety course. Some may dislike weapons, but training will reduce their paranoia. They don't have to learn to shoot if they don't want to (although shooting is a great family pastime in the Harvey house). Just their knowing how to pick up and secure something will ease their minds and give them respect for the safety you desire.