I found my grandmother's sibling whose existence I questioned. I ruined the 2nd page of this birth act but I believe all of the important info is on page 1. I guess I will have to start looking again for his immigration to U.S. This journey continues to have so many surprises. I guess that is what keeps it so interesting for me.
Thank you Tessa & Livio. For those of you who helped me search for a sibling (Francesco, noted on my grandfather Fioravante Ianniello's manifest with a significantly different surname), I am still skeptical about whether Salvatore emigrated to U.S. None of my resources show any name similar to his on a manifest or census report (I don't have Ancestry). But I will keep looking for him.
I am assuming that Matteo Martora(birth act recently translated), was the person my mother referred to when talking about a family of cousins in Bridgeport, Fairfield, CT, She may not have known the correct relationship. He was a cousin because they shared the same great grandfather.
Fioravante's notation on his manifest may have actually referred to a friend instead of a real relative. I know this is all supposition and I will continue to go where the (new) facts lead me. I could not have made it this far without the phenomenal help I have received on this forum.
Thank you all,
Researching surnames Ianniello, Tamburrino, Mattora/Martora/Mattori & Scialla in Santa Maria Capua Vetere, Caserta, Campania.