No one seems to have remarked - and I've only just realized myself - how closely the plot of Jenufa (aka Jeji Pastorkyna, that is, Her Stepdaughter) resembles that of Il Trovatore (aka La Zingara).
Consider: Two half-brothers who hate each other are in love with the same girl - who adores one of them, loathes the other. (The jealousy of the disliked brother is the engine that drives much of the plot.) The fourth character, who is actually the most important and usually steals the show (the glory of mezzo-sopranos!) is a foster mother , possessively, devouringly in love with the child she raised but never bore. (Her love is the real engine of the plot.) A baby murdered by the foster mother also figures.
They say there are only six plots. (Five of them are against me.) I doubt anyone has connected these two before.