"Kids have a personal truth. They have what they believe about themselves," explains Dr. Phil. And that personal truth can get damaged when children live through a contentious divorce.

Dr. Phil tells an ex-husband and ex-wife who have been at odds for years -- at the expense of their 9-year-old son -- how their vitriol can be impacting him. "He thinks he's lesser than. He has a damaged personal truth. He feels like a second-class citizen," Dr. Phil says. "And the problem is you generate the results in life you think you deserve."

How To Make Your Divorce Less Tough on Your Kids

Watch the video above as Dr. Phil reveals the biggest and most frequent mistakes people make in divorce or remarriage:

1. Sabotage -- using child as a pawn
2. Using child for information to manipulate/influence ex
3. Transference of feelings
4. Forcing child to choose sides
5. Family events turn into pressure cookers
6. Using child for companionship/support
7. Treating child as adult
8. Too emotionally needy
9. Overindulgence due to guilt

"I've got two rules with children," Dr. Phil continues. "You never, ever burden them with situations they cannot control, and you do not ask them to deal with adult issues."

Dr. Phil's Dos and Don'ts For Co-Parenting With Your Ex

Children's needs become exaggerated when their parents go through a divorce. Most of all, such children need:

• Acceptance
• Assurance of safety
• Freedom from guilt or blame for the divorce
• Structure
• A stable parent who has the strength to conduct business
• Let kids be kids

He tells the bitter exes: "It's time to start being a fiduciary for your child and put their interests ahead of your own."

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