All that can presently (August 2024) be gleaned about The Amoros Sisters from sheet music covers and by Internet searching is that they were American actress/singers who have been featured on just one work namely I'm the Lonesomest Gal in Town (1912) music by Albert von Tilzer, words by Lew Brown and published by The York Music Co., New York, USA
Variety (1 October, 1910) reports:
A little of everything makes up the special. Singing, dancing, acrobatic work of one of the sisters and the ground tumbling of the other are the features. The ground tumbler has a little comedy that she might carry a bit further. The Amoros are a good live number and will be welcomed wherever they show.

 

Their portrait on the left is taken from the J. Willis Sayre Collection of Theatrical Photographs (SAYRE 12466) dated Aug 26, 1918.
Surfers are welcome to contribute any further information about this performer.