For example, imagine a child doing something wrong and the father tries to correct them, but the mother interferes and says the child hasn't done anything wrong.

This is one aspect of discipline where many parents get it wrong. I know a couple who fought each other two weeks ago because of this. The dad was punishing their son, the mum jumped out and interfere to the advantage of the boy , and stopped the father from punishing him... right there in the presence of the child, the couple started fighting with knives sef...no kind of parenting I never see 😃

And yes, being a role model is a great part...u don't discipline and default in the same offense