Dictation stories are great for kids who are too young to write,
but older children might appreciate them as well. It starts with a simple task:

Drawing a picture.
You can give kids markers or colored crayons and have them draw “scenes during divorce” that depict some of the changes happening in their lives.

Once they are done, get a separate piece of paper and ask them to tell you a story about their picture. Write what they say, and then keep the picture and words together in a folder

Encourage the kids to do these on an ongoing basis, and as they accumulate, you can assemble them into an extended book or collection of stories.

This technique has the added bonus of being an activity you can do quickly and frequently, and which requires little prep work. It’s as simple as asking kids if they feel like drawing about what they are feeling or experiencing, and then taking the time afterwards to record a discussion about their picture. You can do this project as they experience different transitions throughout the divorce. As you gather these different dictation stories, it should also give you an idea about how their perception of divorce and emotional reaction to it is evolving over time.