A: : The fourth generation gate keeper of Classical Yang Family Tai Chi Chuan is Grandmaster Yang, Sau-Chung who was the eldest son of Great Grandmaster Yang, Cheng-Fu, and the eldest bother of Yang, Zhenduo.

Yang Zhenduo is NOT the fourth generation gate keeper as he claims.  There can only be one gate keeper per generation, and that was Grandmaster Yang Sau-Chung.  By claiming the fourth generation gate keeper that was once held by his eldest brother (claimed after the latter's death), Yang Zhenduo is committing the greatest dishonor to his brother, the family legacy, and to other classical Yang family tai chi chuan practitioners.

Furthermore, it was Grandmaster Yang, Sau-Chung who taught the FAMILY version toYang, Zhenduo, at a very young age.  Incidently, there is also a belief that Yang Zhenduo forgot the family version after the family got separated, and he had to relearn the tai chi chuan form, which was the PUBLIC version from Fu, Zhongwen.    

Yang Jun may be the sixth generation Yang family member, as he is a grand-nephew of Grandmaster Yang, Sau-Chung, but he is NOT the fifth generation gate keeper of Classical Yang Family Tai Chi Chuan.  If Yang Jun is not the fifth generation gate keeper (Zhang Men Ren - 掌門人), then, who is the rightful 五代掌門人?

As a footnote, speaking the truth or seeking for the truth about Yang family tai chi chuan is not unethical for anyone.  It has nothing to do with "your teacher's" martial moral characters.  It has nothing to do with "your" martial moral character.  An individual tai chi chuan practitioner has every right to seek for answers and discard any misinformation.  If anyone is unethical, it is those who have deliberately presented the misinformation or have adroitly evaded the pertinent questions.