When we come AT our children with rules and regulations, they instinctively resist. But when we enlist them in collectively addressing a problem by contributing possible solutions, they will also be more likely to adhere to agreements they took part in creating.
Maybe saying grace feels hokey or forced to you. Perhaps you think your kids would roll their eyes. If you don't believe in God, the ritual before the meal may feel unnatural: who exactly are you thanking, and why?
All I want is peace and for the game to end before I'm old enough to sprout hairs out of the moles on my face. As I pack up the evil pieces, eye still twitching, I somehow keep it together and say, "That was fun," and wonder if anyone believes me.
Listen to your children's point of view without interrupting; perhaps they don't look forward to dinner because one sibling constantly teases them. The more you can get feelings out in the open, the more you'll reestablish yourselves as a team.
all in all, we've become precious and perfectionistic about food to the extent that it almost seems not to count if we eat really well MOST of the time, while giving ourselves a break SOME of the time.
Perhaps it's time to establish some basic "Rules of Civility" for technological use. These are circumstances in which you will absolutely, positively damage your relationships if you are on your phone.