I hail from Christchurch, NZ, so went through Sept 4 2010, which was a 7.1, and Feb 22 2011, which was a 6.3.
We went through 15,000 aftershocks, I can't remember how many were mag 4 or over.
It's important to remember that the richter scale is a lot different to the mercalli scale, in which the forcefulness of the earthquake is recorded. An earthquake that is lower on the richter scale, can be a lot higher on the mercalli scale, because the depth at which the shaking occurs can be a lot closer to the surface, for example.
The best things you can do are fix furniture to the walls, make sure things that will cause damage to you if they topple over on you are fastened down. Blue tak or the equivalent is your friend for ornaments - or put them away!
Also educate yourself on how best to protect yourself in a quake - generally now they don't say get in a doorway, but do get under something solid, like a desk or table. Oh, and hold onto the legs, or you might see your desk or table bounce merrily away from you.
Do make sure you have water, torches, wind-up radio, basic rations. And chocolate.
With children, playing 'guess the mag'' helps lighten the mood - and everyone gets a prize. It's best if you can try not to show anxiety around them, and be very matter of fact. My two were five and seven at the time. Sometimes I managed this, sometimes I didn't. Try to keep them out of trees and not climbing rugby posts. . .