Partly because his oldest brother Hisao KANZE died and the second older brother quit Noh temporarily (the third brother died young), he succeeded to Tetsunojo in 1980, the next year when his father changed his name to Gasetsu.
長兄観世寿夫が没し、次兄観世栄夫がいったん能楽を離れたこともあり（三男は夭折）、父が雅雪と改めた翌年の1980年に銕之丞を襲名した。