Some psychiatrist is going to retire early on this kid’s problems.
A Czechoslovakian study on incest showed that children born to first-degree related parents (siblings, parent - child) were 40 to 50 percent more likely to have severe genetic birth defects (hemophilia, congenital organ failure, congenital blindness, etc.)
https://www.psychologytoday.com/blog/animals-and-us/201210/the-problem-incest