Översättning - Spanska-Engelska - dos hijas a cual más fea

I have now found a reference to this phrase on another website (wordreference.com), it means 'two sisters each of them more ugly than the other'. It refers to it as a loc (locución?) which would seem to be a set expression.

It's tale of "Cenicienta", full text from :


It's Spanish so the syntax is a little different.

in Chinese it should be "一个比一个丑",

Enjoy the whole story of Cinderella&Prince