I was speaking to nothing more than the familial estrangement. If they couldn't bond...why? These things have roots in families of origin.
Yes they do...but the patterns in all their relationships show this. Not allowing others in or to get close. Only relying on each other. The loss of the other or threat of it would be the end of the world. The ability to bond, empathize, etc...need others questionable due to the patterns. Perhaps needing to be needed. But an avoidant attachment style