Never Marry Anyone Crazier than You

Another example of assortative mating? People with Mental Health Disorders Often Marry Each Other. I'm sure you all know a few examples from your life, too.

People with psychiatric disorders may be likely to marry and have children with other people who also have psychiatric disorders, according to a new study from Sweden.

The study did not examine why people with psychiatric conditions, such as schizophrenia and depression, may tend to mate with other people with such conditions, and therefore, the mechanisms behind this phenomenon are not clear, said Ashley E. Nordsletten, a co-author of the study and a postdoctoral research fellow at Karolinska Institutet in Stockholm.

But one possible reason is that people may simply select partners who share certain traits with them, she told Live Science.
. . .
It turned out that people with psychiatric disorders were more likely to marry and have children with people with either the same disorder as they had or a different psychiatric disorder, than they were to marry and have children with people without psychiatric disorders.

Could it just be that sane people avoid crazy people, leaving them to marry each other? Some questions are just that simple.