I really don't see this family as "falling apart." I see two strong people, in love with each other, real with each other, who clash sometimes.
And clashing is a necessary part of sorting out who you are together. At least, that has been true in my 40 year marriage.
My DH and I are polar opposites. Don't ever get us going on politics. But, we seem to complement and complete each other. We have learned to stand up to each other respectfully with affection and trust. Even before we learned that, we would clash but make up with amazing abandon.
I don't see these two giving up on each other, or falling apart, any time soon. I suspect they are in it for the long run.