The idea that children are passive repositories to be shaped by their parents has been massively overstated. A child's peer group is a far greater determinant of its development and achievements than parental aspiration.
Parents provide their children with genes as well as an environment, so the fact that talkative parents have kids with good language skills could simply mean that and that the same genes that make parents talkative make children articulate.
So no, it's not all in the genes, but what isn't in the genes isn't in the family environment either. It can't be explained in terms of the overall personalities or the child-rearing practices of parents.
For example, parents who talk a lot to their children have kids with better language skills, parents who spank have children who grow up to be violent, parents who are neither too authoritarian or too lenient have children who are well-adjusted, and so on.
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