The paragraph is followed by an incomplete phrase or sentence which summarizes the main idea of the paragraph. Choose the missing words of the phrase or sentence.

Healthy families maintain parental authority and flexibility. They listen to their children’s wishes，complaints and feelings and make decisions based on what they believe is best for the child. They don’t give in when society or children object. Instead, the parents state expectations and explain rules clearly and reasonably. Such parents also tend to allow children a voice in rules and consequences as they mature.
（） of good parenting.