As I see it, there are a couple of major problems with successful people trying to teach others (including their children) to follow in their footsteps.

1. You can't give advice (i.e. answer questions) to people who don't want it (i.e. are not asking questions)
2. Someone out of your vibrational range cannot hear what you are saying anyway

Situation 1: Where someone doesn't need help:
Someone well-meaning comes along and wants to share some life lessons with someone who doesn't believe they need them. You just end up with two people who get angry and resentful of each other. One because they believe the other is not listening to them, and the other because they believe the former is trying to trample on their freedom regarding what they should or shouldn't do.

Situation 2: Where someone does need help but you are too successful:
Here you have someone who is asking for answers but the person answering is (for want of a better phrase) too successful to help them...i.e. they are too far out of the asker's vibratonal range. The answerer of the question might be revealing magnificent and profound universal truths that took a lifetime of effort to unravel but all the asker hears is blah, blah, blah. They just hear and read what they think is meaningless waffle...because the answer is too far from where they currently are vibrationally. You can observe this phenomemon on this website all the time when someone asks a question and then completely ignores what others can see is the most useful answer to them. :) It's not their fault, they are just vibrationally out of range of hearing it.

So what's the solution?

Simple. Don't try to teach anybody anything if they are not asking for it. And if they are asking, only answer as specifically and briefly as you can until they ask another question.

If you are too far out of range for them to hear any answer, just trust that the Law of Attraction will line them up with someone who is more in range for them.

So does that mean that there is nothing much you can do to save others (including your children) from learning the lessons that you already have?

Yes, that's pretty much it - they have to figure it out as they go along, because that's what they came here to do (like you)...because that's where the joy of life is anyway...launching constant desires for things you want (or want to know) and coming into alignment with them.

No knowledge is lost because, at any time, anyone can align their beliefs with their desires and receive any answer they want, but they have to do it themselves ultimately.

If any of us really wanted to know all the answers upfront, we would allow ourselves to keep the memories of all our previous incarnations as we are born.

This wiping clean that happens at each birth allows us to have a fresh, clean perspective in each lifetime from which to launch new desires.

However, that doesn't mean that society is not evolving. As new desires are launched, physical reality molds and manifests around those desires to create a more evolved physical platform. And those who are being born subsequently are already up to speed with the new reality and are then launching their desires from this newer platform...and this includes the vibrational essence of the knowledge that has already entered the mainstream.

So, looking at it this way, if there is any teaching at all to be done, it should be the children teaching the adults what they have forgotten :)