There are several links and websites with material designed to help children (and parents) understand more about their feelings when their parents separate. Here are a few. The videos are particularly moving.
http://www.voicesinthemiddle.org.uk
http://www.cafcass.gov.uk/children.aspx
https://t.co/WAJwnSFTbR
A short video from the perspective of children - co-parenting after separation is hard, but your children will flourish because of your courage
https://m.youtube.com/watch?v=0Bf3CJZ4hvg
This YouTube video link presents a moving song written by James TW highlighting a teenager’s experience of his parents’ separation