If the father gets up at 8 AM, their children will get up only after that only. If the father smokes in front of his son, the son will never hesitate to smoke if not in presence of his father but in his absence. So elders should practice all good habits so that their kids will also learn them.
Elder should listen to the opinion of a child if he/she has some contradictory views and if the elder person feels the child is completely wrong they should try to teach them patiently and peacefully and if they feel the child is on the right track they should let the child the way he/she is doing it.
And elders should understand that difference of opinion of a child or choosing a different direction by a younger person is not disrespectful.
"It is hardest thing in the world to be good thinker without being a good self examiner"