You may want to compare stats on transport by car, bus, bicycle, motorbike et al. They make intersting comparisons. Even walking somewhere is more 'dangerous' than flying.
If they (your family) are willing, I suggest a trial flight for them, and if possible get the instructor to demo an 'engine failure'. You'd be suprised the number of people that don't know about autorotation and think helos just drop out of the sky when the engine stops!