By setting good upfront common sense examples, but example only goes so far sometimes.In today's society, it seems to be that the most with any appreciable amount of common sense are in fact older. Unfortunately not much we can do about that ...... except be vigilant.
Some take advantage of that and then the "fun" begins? ....
On bright side lately, have seen some darned good kids with common sense and good manners too.
It's there, just not as much as used to be.