Scouting is a good way to involve and educate others in preparedness. The Emergency Preparedness merit badge is an Eagle required merit badge and the pamphlet is very good. If all you know is what comes from that pamphlet, you will be well prepared. That merit badge also requires that the family be involved in the preparing. I like to teach it rather than have individual scouts work on it, and I like to have the parents and siblings there if possible. It is difficult in a large troop though.
I also like to do that merit badge in conjunction with the First Aid and Wilderness Survival merit badges. I think of these three as the three legs of a tripod as they are mutually supporting.