My great-grandparents, Francesco Truncali (5 Dec 1876-1943) and Rosalia Raia (8 Mar 1911-2 June 2003) have little information. My great-grandmother has more documentation after moving to the U.S., but I know nothing about my great-great-grandparents or cousins. My great-grandparents lived in Caltabellotta, Sicily; my great-grandmother was 18 or 19, and my great-grandfather was 53 or 54 when they married. My great-grandfather had a first wife, Maria Prinzivalli, who passed away, and they had one son, Giuseppe (Abt. 1909-1976), who immigrated to the U.S., most likely in the early 1930s and died in 1976. My great-grandparents had three sons, one of whom was my late grandfather, Salvatore (21 Feb 1936-17 May 2023). All three of their sons immigrated to the U.S. and became citizens. According to one of my granduncles, they have cousins in Sicily, but no one has contacted them in 20 years. I know virtually nothing about any siblings or parents of my great-grandparents, and I want to find out if I still have any missing relatives and try to expand my family tree.
Edit: For more context, my great-grandparents married in Caltabellotta, Sicily. My grandfather and his brothers were born and raised in Caltabellotta, Sicily, and my late grandfather immigrated to the U.S. in 1966, and his brothers at a similar time. My great-grandmother moved to Florida sometime after that, probably in the 1970s.
2nd Edit: I have been informed of the actual birthdate of my great-grandfather and will be making edits to my question as new information comes up.