4. what evidence from the area of parenting supports pinker's theory that we are influenced by genetics and heredity?

The evidence from the area of parenting that supports the theory that we are influenced by genetics and heredity can be found on the following claims from Steven Pinker. 

           " They're useless because they don't control for heritability. They measure some correlation between what the parents do, how the children turn out and assume a causal relation: that the parenting shaped the child. Parents who talk a lot to their kids have kids who grow up to be articulate, parents who spank their kids have kids who grow up to be violent and so on. And very few of them control for the possibility that parents pass on genes for -- that increase the chances a child will be articulate or violent and so on."
                                                                        --Steven Pinker---

I hope this helps..:)