There is a relatively large body of writing attributed to Wu Yu-hsiang on the subject of t’ai chi ch’uan theory, writings that are considered influential by many other schools not directly associated with his style.
His most famous student was his nephew, Li I-yü (李亦畬, 1832-1892), who also authored several important works on t'ai chi ch'uan. Li I-yü had a younger brother who was also credited as an author of at least one work on the subject of t'ai chi, Li Ch'i-hsüan.
The style of t'ai chi ch'uan that Wu taught was eventually known, because of its later transmission by three generations of students of his nephew named Hao, as Wu/Hao style t'ai chi ch'uan. Hao Wei-chen subsequently taught Sun Lu-t'ang, the founder of Sun style t'ai chi ch'uan.
This family tree is not comprehensive.
LEGENDARY FIGURES
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Zhang Sanfeng*
circa 12th century
NEI CHIA
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Wang Zongyue*
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THE 5 MAJOR CLASSICAL FAMILY STYLES
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Chen Wangting
1600-1680 9th generation Chen
CHEN STYLE
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Chen Changxing Chen Youben
1771-1853 14th generation Chen circa 1800s 14th generation Chen
Chen Old Frame Chen New Frame (Small Frame)
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Yang Lu-ch'an Chen Qingping
1799–1872 1795–1868
YANG STYLE Chen Small Frame, Zhaobao Frame
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Yang Pan-hou Yang Chien-hou Wu Yu-hsiang
1837–92 1839–1917 1812–80
Yang Small Frame | WU/HAO STYLE
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Wu Ch'uan-yü Yang Shao-hou Yang Ch'eng-fu Li I-yü
1834–1902 1862–1930 1883–1936 1832–92
| Yang Small Frame Yang Big Frame |
Wu Chien-ch'üan | Hao Wei-chen
1870–1942 Yang Shou-chung 1849–1920
WU STYLE 1910–85
108 Form |
| Sun Lu-t'ang
Wu Kung-i 1861–1932
1900–70 SUN STYLE
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Wu Ta-kuei Sun Hsing-i
1923–72 1891–1929