This is a tradition that has gone by the wayside. Many parents will tell you that their families are too busy to all sit down together for dinner. Yes, people are busy. Nowadays one or both parents work and children have a variety of activities after school and on weekends. In our family, we make the time to have meals together. It is a little more difficult given our son's meal schedule (he eats dinner at 6) but we all try and at least sit together while he eats. On weekends we have all (or mostly all) of our meals together.
It is not about the meal. It is about making time to sit and be with your family without outside distractions (read: smart phones, tablets, etc.). It does not have to be anything formal or fancy - you just have to spend time together and catch up on what is going on with your family. The concept is not difficult, but it reaps huge rewards. You have to make time to be with your family, and what better excuse than a meal...