Genetics play a large role in our physical appearance, our health, and many other aspects of our lives. Of course, so does the environment in which we live. For decades—if not longer—researchers have been exploring the impact of what is colloquially known as “nature vs. nurture” on a wide variety of human behaviors. Forming healthy interpersonal relationships would seem to fall into the category of learned behaviors—or nurture—but new evidence suggests that genetics may have an effect as well. Divorce, it appears, may be genetic and runs in families as a result.