Switching kids from one home to another is very hard on the kids. Most adults are trying to survive these verbal and situational interactions, hoping their kids don't see and hear. Of course, kids are adept at reading all the signs between their parents.
Certain parents are not good about keeping their thoughts about their X from their kids and that has to be a top priority, along with not using kids to pass messages, papers, etc.
The research shows that "blending" a family takes about seven years.
Many marriages can be saved and in fact become stronger and more intimate. Many people give up too early in the counseling process, especially after waiting too long to begin the process (average six years of problems).
Please don't confuse TV with life.