He was adopted by Genpaku SUGITA by marrying his daughter, however soon got disowned (as for the reason, it is said that Genshin had indulged in dissipation probably because he had been still young).
一時杉田玄白の娘と結婚、養子となったが離縁される（若気の至りか放蕩を重ねた故といわれる）。