The realization hits that needs have not been met in the relationship. Any may be directed toward self or others. Anger is understandable. Parents have broken an unwritten rule. They were supposed to provide stability of family life to enable children to move through their developmental tasks.
Children are angry about the pain.
They are angry about the failure of their parents to find another solution. They are angry about the changed financial status with which they must cope. They may be angry with themselves thinking they have caused the divorce. Their anger puts them in a double-bind. They recognize their parents as particularly vulnerable right now.