It is my understanding that due to ethical concerns, the scientific field of psychology does not have a data collection methodology capable of distinguishing between effects caused by the parents' genes and effects caused by the parents' actions

Your understanding looks silly. It is rather obvious that not all children are brought up by their parents and that has been used in a number of studies. In fact, many classic identical-twins studies rely on being able to find genetically identical people who were brought up in different circumstances (including different parents).