My grandmother was Ninfa Abate Parrino. She arrived about 1903. My grandfather Liborio came over about 1899 and it took him four years to save the money to bring her to America. She could be an in-law that came with your Margherita. Which means my grandfather could be related.
Many if not all the Parrinos I have found so far seem to have come from Alcamo, Sicily. They may not have been siblings, but could have been cousins.
Liborio's mother was an Impellizerri. If you run across that name it could provide another clue.