"My Brother's Husband" by Gengoroh Tagame. Linking two threads for this. One dedicated - for the
Manga, which has been translated into several languages. One more general - for
Live Action announcements - containing information for an upcoming TV mini series - NHK Premium Drama adaptation of that manga.
Also just tagged the "
Yotsubato (Yotsuba&)" thread with family and children tags so that manga series too will show with those criteria - but that one too may need a little more expanding here at some point.