Someone said you need to concentrate on bugging in but you can't know which your going to do until the situation happens so you need to be prepared to bug in out bug out.
What is your environment like, what kinds of disasters are likely to happen? House fire can affect anyone, then there is the possibility of flood, hurricane, tornado, power outage in the winter, etc.
Start with basics such as extra food and water.
How old are your kids, do you need extra diapers, baby food, formula, etc. If you pug out can your kids sleep in a normal bed or do you need a portable crib?

for a vehicle an extended or quad cab truck can still haul kids and is a little cheaper than an suv and usually gets better fuel economy and also you have a separated cargo area, that is a safety feature because you can haul fuel without fumes in the cab.

Do you and your wife both work, or is one at home? If you have to evac work and can't get home have a planned meeting place and backup or two.

Anyone that works outside the home should have a get home bag to assist you in getting home should you need to.

you should have go bags packed for each family member with whatever they need to survive should you need to leave.