I think it is less about teaching them to be a certain "party" and more teaching them morals and values and humanity and letting them come to their own conclusions.
Democrats are not alone in having morals, values and humanity - and it used to be they were not the only party that has a middle. I do believe that just as children can learn hate, prejudice and small-mindedness from their parents, they do learn about empathy, social justice, equity and responsibility. Just as I taught my children simple science in the everyday world, I explained the consequences of political decisions made in voting booths.
Of course the book [url=BellaOnline ALERT: For anti-spam reasons, we restrict the number of URLs allowed in a given post. You have exceeded our maximum number of URLs.