I believe it is true, in most scenarios. When someone’s wife is happy it will resonate through the entire house. The husband, as well as the children, will not be affected by the mothers stress and bad moods, thus everyone are happy.
Conversely, if the wife is sad, everyone in the house will feel it too. For example, when a wife is unhappy they often rant at you, or worse they will not talk. In this case, you would not know what concerns the mother is having. As a result, some will just prefer to keep silent so that it will not worsen the situation.