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Parents should be a good example for their children. We know that the nature of a child is to imitate their parents. So, as parents act, children will surely try it too. As for this, the thing that must be done is to inform the child's awareness of the things or consequences that will occur if doing so (this can be related to any action that has consequences).
There's no such thing as a perfect parent to be a perfect example for being good as it would be followed by your kids.I've seen some parents which do mold or guide their kids on the right way or good path but still
ending up on messing up their lives due to their own decisions into their lives.Yes, nothing could really be controlled but showing off something good into your kids is mostly or likely to be followed by them.