In southern China (not including Hong Kong and Macau), where the difference between Standard Chinese and local dialects is particularly pronounced, well-educated Chinese are generally fluent in Standard Chinese, and most people have at least a good passive knowledge of it, in addition to being native speakers of the local dialect. The choice of dialect varies based on the social situation. Standard Chinese is usually considered more formal and is required when speaking to a person who does not understand the local dialect. The local dialect (be it non-Standard Chinese or non-Mandarin altogether) is generally considered more intimate and is used among close family members and friends and in everyday conversation within the local area. Chinese speakers will frequently code switch between Standard Chinese and the local dialect. Parents will generally speak to their children in the local variety, and the relationship between dialect and Mandarin appears to be mostly stable, even a diglossia. Local dialects are valued as symbols of regional cultures.