You're both right, of course; what goes on in the home, and the role-models there, have a significant impact on childrens' development, no doubt outweighing TV and other influences to a certain extent. Responsible guardians like yourselves and others (I consider myself one) are to be applauded.
However, advertisers do not feel the same responsibilty; there is a definite and deliberate trend in marketing - particularly in the food, and clothing and footwear markets - to target 'market aware' children at an ever younger age. Children of today are consumers at an earlier age than previous generations. The rapidly changing pace in our society regarding technology, information processing, transportation etc. makes it possible for them to experience purchasing and consumption at a much faster rate. Companies are also becoming more aware of children as important customers today, but also as brand loyal customers in the future.
I think that we all, as a society, have a wider responsibility to all children (hey Rev.: 'I believe the chidren are our future ...
). Not all parents and guardians are as enlightened or fully informed as others. However hard we try to protect our kids, marketing is becoming more pervasive than ever. We need to draw a line, or we're in danger of producing a generation of consumer monkeys.