Also the very early age does count in the way the kid will behave later.

The most important thing to know is that kids are learning from excamples, if you as a parent are good excample and the envoirnemt the kid is as well, there is a big chance you could trust eachother. Also, the kid must to know the rules of the world, what is good and what is bad. The faster the kid find his/her own inden y, the faster she/he will know what you as a parent is about and everything else is about. That is called grown up - taking responsibility for the bahavior and accept the potential punishemnt. So no reason to lie for excample.

I never hidden anything from my Mom, but I can tell you I was a problematic kid. And how Mom survived and now having realy good relationship with me is beyond me

It's maybe differently from here (poland) and there (america) looking at the history of both countries. We had WWII and not far from it a communism...
Umm when my Mom was a kid she would never be let in the room where the grownups were talking, never. And when I was a kid that has changed. Now the modern parets let the kids do whatever they want and we see the results in schools. The education level went down (but still higher then in america :P). And the respect for the teachers is none. When I was going to school we had respect, we hated the teachers but all in all we could not think about the things the kids are saying and doing now.