There are some things you just can't do anything about.
We can't do anything about who we are born to, and how and where we're raised. Those choices are all in the hands of others. And neither can we choose the human faculties with which we're endowed: our pleasure/pain mechanism; our emotional faculties; all those bloody hormones charging around... if that was all we had -- if nature and nurture were the whole of the debate -- then that would be it, and we would be ruled only by our animal functions, as indeed all other animals are
But we humans have a certain trump card to play, something different on top of all that which changes the game. Man -- as Aristotle defined him the rational animal -- has rationality on top of his animality.
Rationality gives one great thing that's a game-changer in the nature/nurture 'debate,' something called Free Will.
Specifically, what free will gives us is the capacity to turn on the conceptual faculty of our brains, and to make our own choices. That's where our free will starts; the choice for each of us is what we can do with that.
Free will means we are not contained either by our nature or by our nurture: these two are simply our starting points with which we can then either take wing, or take flight.. What we are given is given by nature and nurture; what we do with what we're given is then entirely up to us.
Philosopher Tibor Machan puts it this way. What we're given by nature and by nurture he calls our personality. These are the things about which we have no choice -- our particular skills, talents, and faculties. What we then make of all this, he calls our character.
The 'nature/nurture debate' as it's popularly termed is just too simplistic, reckons Tibor, and conveniently excludes what makes us distinctively human. If we are to have a debate, it might be better couched as one of nature/nurture and free will.
Our free will makes us distinctively human; it is what gives us wings. As the poet said, by our choices may you know us. It is wrong to have this particularly human faculty excluded from a debate about what it is to be human.