Even if parents and children talked a lot in the beginning, they can still talk about the divorce every once in a while. Choose a time when both parents and children feel good. Find out if a child has any new questions. Having an open conversation means a lot to the child. If it is not possible to do this oneself, find someone who can, maybe a professional.
Children can express themselves in other ways than with words.
Play is very important. Children may need to work off tension through energetic games. Drawing may help a child. Children often draw what is important to them. Parents should not tell their children off if they don't like what they hear.