You guys are already related to each other.. why you want to add one more relationships?

Marry someone else and establish one more relationship.. spice up your life.

It's true genetically, it's not a good idea to produce off-spring between you two, coz that may mean that imperfect baby might be born. Why to take risk? Out forefathers were smart in a way, whether they knew it or not about genetics, but they insisted that you marry with a person who is at least 7 pusta apart.