末まつ妹まいまつまいMeanings1nounyoungest sisterRefers specifically to the youngest sister among siblings. A straightforward kinship term.彼かの女じょは三さん人にん姉し妹まいの末まつ妹まいです。She is the youngest of three sisters.末まつ妹まいはまだ小しょう学がく生せいだ。My youngest sister is still in elementary school.