The important factor that could link us is what your Mattera grandfather's first name was and where he came from. My paternal grandmother, Filomena Mattera Terrazzano was born in Lacco Ameno around 1860, I can give you the exact date if it looks good!, and lived in Casamicciola. I know we have relatives in Providence, but the Mattera name is not uncommon and they all seem to come from Ischia. Filomena had two brothers, one Giuseppe and for the life of me I can't remember the other - although I do have documents! Check out your records and let me know one way or the other if you feel we are connected.
Phyllis (Filomena is my alter ego!)