What is the mang family s history in avatar the last airbender?

The evidence provided discusses the Southern Praying Mantis martial art, a Chinese fighting style originating with the Hakka people and associated with other Hakka styles like Southern Dragon Kung Fu and Bak Mei. It describes the style's emphasis on close-range combat, short power methods, and hand techniques similar to street fighting. However, this evidence contains no information whatsoever about the Mang family, any family histories, or Avatar: The Last Airbender. Without verified evidence about the Mang family in this context, I cannot provide any details about their history, role in the Avatar universe, or relevance to the series.