An article about them in Der Spiegel states that the couple are happy together.
How the early Christian church gave birth to today’s WEIRD Europeans
The marriages were entered into in Scotland and Switzerland respectively, where they were legal.
For example, the accusation that Anne Boleyn and her brother George Boleyn had committed incest was one of the reasons that both siblings were executed in May
His first criterion was that follow-up research on rapists and extrafamilial molesters should be studied while research on incesters and intrafamilial molesters should be screened.