According to their daughters, my grandparents first met on the ship that took them to America from Italy. However, according to immigration records, they arrived on different ships. I'm thinking that somehow they met as they were processed through Ellis Island. However, I don't know of any way to at least confirm the possibility that this could have occurred. Here are their immigration records:
Well, since you found their manifests and they did arrive at NY, and thus Ellis Is., on the same day, doesn't that confirm the possibility that they met as they were processed through Ellis Is.? What more evidence are you hoping to find?