[a fool in paradise]

Her "open-minded guy" husband's open marriage is soon about to be closed and he's gonna find himself on the outside:

Regardless of the risks, the half-siblings plan to eventually live together — and officially marry.

[usconservative]

Her "open-minded guy" husband's open marriage is soon about to be closed and he's gonna find himself on the outside

As do more than 85% of marriages where incest is involved in some way.

My now ex-wife (of nearly 30 years..) was a victim of incest, I didn't know it for much of our marriage. When I found out it explained much about her.

The collateral damage incest does is almost unending. A marriage failing because of it is just the beginning, and that damage goes on for generations.