http://www.youtube.com/watch?v=pXgKmtPL3D8
Grandmaster Bow Sim Mark: 1986 Tai Chi Sword
Published on Jun 5, 2013
Grandmaster Bow Sim Mark, mother of kung fu actor Donnie Yen, performs tai chi sword at the Josiah Quincy School in Boston, MA, in 1986
Other stuff:
http://www.youtube.com/watch?v=68rRZ_2oo_I