have you checked with the anglefire.com/journal/tassinari
there are at least 40 pages of Tassinari's listed,
My great grandmother was married to Alexander Tassinari who was accidentley shot by Enrico Gallarani in 1896 I remember seeing something about Alexander's brother may have married a Gallerani which may be your ancestors.
They were born in Cento, Renazzo Italy and they were probably from Tremont village in Wareham.
I have an Aruilia Tassinari married Joseph Tassinari
and a Caesar "Chesro"Tassinari married a Linda Gallerani on my tree, anything sound fimilar?