What is the nature of the emergency? This is the first question that should enter the mind. Is it short term? Car accidents, fires, explosions, etc. could be considered short term. Is it longer? Blizzards, floods and the like may be part of a longer term situation. Is it long term? War, depression, etc. may require a different approach to survival.
Always start with first aid to any and all injuries, no matter how insignificant. If the area is dangerous, then, while fist aid is given to the most serious injury, a decision needs to be made to leave the area or remain. Take into account the ability to move all the injured when it is time to decide to leave.
Transportation is the next thing to consider when looking and changing location. First, where to go. Would it be safer to remain right where you are? Many times, this is the case. But if you must go, the question remains, where is a safe location for you (and your family)? And then how can you safely get there? Is a vehicle needed? Is a vehicle available? Does it need special accessories (four wheel drive, high ground clearance, etc.)? Is a snowmobile, boat, etc. needed to get there?
All these things need to be set up beforehand with a backup plan to make sure you get where you need to go. Planning to survive makes the chances of survival rise. Set up a meeting place with your loved ones, in advance, should something happen. Put together an emergency kit and keep it ready. Create a plan for a short term emergency, longer terms (three day, two weeks, 3 months) plans, and a plan for a long term situation. The time spent planning will be well worth it!