Families embroiled in a problem need to do what may be difficult - recognize that it may take time to work through it. That is a problem when the family is facing an immediate disagreement that freezes progress or destroys harmony. When something is aggravating, first preference may be to get beyond it by reaching an agreement. Or, it may be to ignore it in hopes that what is hard to face does not actually have to be faced and that somehow, the problem will just subside.
Neither approach works most of the time, if ever really. If the disagreement is just a manifestation of something grounded in years of being in the same family, it will take time to discuss "how we got here" and how to really get to a better place. If the disagreement is just one more chapter in a years long book of family, it may take a few more chapters to make meaningful improvements, some of which may be needed to solve the immediate problem.
That is why they say "an ounce of prevention is worth a pound of cure". It is as true for family health as it is for physical health.