If you haven't made a regular habit of family dinners, see if you can fit in two or three a week. Just do the best you can. Start the conversation while you're preparing dinner. Invite one child to help you in the kitchen. It's a great way for some special time alone.
Conversations can continue during clean up.
Dinner is not the place to correct or criticize your kids. Try to make your meals a time when everyone can Relax. Ask specific quesitons. Family dinners don't always have to be dinners. Try a weekend breakfast or lunch.