You need to be more specific with your request of what you want to find. Did your ancestor come from the town of Palermo or the province? Have you found passenger manifests? Located the family on the US census reports? Are you looking for family in the US or Italy?
Let us know what you have found and what you want to find. Specific names, ages and places they lived help. The more information you can provide the better the responses will be that you get.