This past weekend, the U.S. marked the 20th anniversary of the attacks of September 11, which took the lives of almost 3,000 people and plunged the U.S. into two decades of warfare. And on this coming Tuesday, September 21, nations around the world will celebrate the U.N.-sanctioned International Day of Peace, which calls for a nonviolent day of strengthening and promoting the ideal of peace, including a ceasefire during any local conflicts. Physician and educator Maria Montessori had quite a lot to say about peace education. She believed that “Averting war is the work of politicians; establishing peace is the work of the educator.” But there is one other place that the education toward peace begins, and that is in the home.

Families have to lay the groundwork of healthy relationships before they can achieve their maximum potential; they have to address the five dysfunctions. So what are those dysfunctions? Lencioni identifies them as: 1) absence of trust; 2) fear of conflict; 3) lack of commitment; 4) avoidance of accountability; and 5) inattention to results. Let’s take them one by one.