閨閥

プログレッシブ和英中辞典(第4版)

けいばつ【^×閨閥】

「an alliance [a faction] centered around one's wife's relatives

閨閥政治

government by the relatives of the ruler's wife; uxorial nepotism

出典　小学館「プログレッシブ和英中辞典(第4版)」