Well, in a sense, nothing is independent of genetics or upbringing, so how do you decide that something is caused by either one? Can it not be caused by either?

Well, in a sense, nothing is independent of genetics or upbringing, so how do you decide that something is caused by either one? Can it not be caused by either? Regardless, the obvious implication is something developmental or environmental is important, after conception, but not particularly related to parenting behavior.