> Would genetics lead to some personality disorder that are common in a family, and would that lead to similar personalities? To some extent, yes. "Personality

> Would genetics lead to some personality disorder that are common in a family, and would that lead to similar personalities? To some extent, yes. "Personality disorders" are caused by a combination of genetic predispositions and behavior. For instance, someone with a high level of sensitivity might learn from their parents and the environment to become anxious. > I would also guess the definition of personality could be rejected by skeptics The thing to understand about psychology is that all the lines are arbitrarily drawn, and other cultures have traditionally had other labels than the west does. There's honestly no escape from the arbitrariness of it, but it helps to come up with some sort of system.