Origin of TAI CHI 2 PERSON FORM

[jjustinmeehan]

I would like to know what the origin of the Tai Chi 2 person form is from the Yang style. I have heard several different versions including Yang Jun stating that "Originally Yang family members engaged in paired practice on individual moves only; they did not have a continuous two-man form per se. A student of Yang Chengfu named Chen2 yan4 ling2 created a two-man form by connecting up some of the single move elements that Yang Chengfu showed. The same thing with the fast form. The Yangs themselves did not have a fast form; some of Yang Chengfu's students created these fast forms" I would like to no more about the historical origin and sources for same, thanks so much