His first son is Kikuhiko NISHIDA - Director of the Professional Golfers' Association of Japan, former executive of the Bank of Tokyo Ltd., the elder brother of Sotohiko, and the brother-in-law of Princess Hanako who the wife of Princess Hitachi.
西田幾久彦　財団法人日本ゴルフ協会理事、元東京銀行常務、外彦の長男、正仁親王妃華子の義兄