The third son Shinzaburo (then president) filed a suit seeking reversal of the second will which Shintaro owned, based on that: at the time of creating the second will, Nobuo, who suffered a stroke, did not have the capacity to draw up a will while under conditions requiring nursing care; in contrast to the first will written with a brush on rolled paper with a registered seal, the second will was written with a ballpoint pen on letter paper (note that the form of paper is not a legal issue); and the seal placed on the second will was not Ichizawa (一澤), but Ichizawa (一沢) which was the registered family name of Shintaro (Tsunesaburo (the former president, then executive director), the younger brother of the late Nobuo, also made the same argument).