To give an example in layman's terms: a mother may tell her child he cannot have cookies from the cookie jar. The father, regardless of his beliefs, cannot tell the child it is okay to have a cookie as that would result in a conflict with the mother. If the father sees the child taking a cookie anyway, he may choose not to say anything.
To illustrate using everyday language: a mother might tell her child he cannot have cookies from the cookie jar. The father, regardless of his beliefs, cannot say it is okay to eat a cookie because that would contradict the mother's decision. If the father sees the child taking a cookie anyway, he may choose not to intervene.