Yumi Nakamura is the head instructor where I practice in Toronto (http://aikidotendokai.com
). My understanding is that she started at the Osaka dojo. Yukio Kawahara Shihan, who trained with Tanaka Bansen, was a senior student there when she started, and there is still a close affiliation between them here in Canada. Other senior students and instructors here are also connected with Kawahara Shihan; I am often curious how much the aikido we practice is influenced by Tanaka Bansen's teaching, but there's woefully little information available.
There's some video on our website (on the 'about' page), if you care to compare styles...