It has been a really long time since your post so I'm not sure how helpful this will be to you, but others out there may find some valuable information in this post. Gabriel Serafini and Giovanni Serafini were brothers. Gabriel arrived before Giovanni (the manifests showed that Gabriel was Giovanni's sponsor for his visa to come to America.) Giovanni died young, and his wife Palma never remarried. This is why you never heard of an Uncle by that name. They had many children which remained in Leominster, except for the eldest son Antonio, who left for a brief period of time. As my mother tells me, Antonio left his widowed mother upon her request, lest he be burdened by raising the young children (as is custom) as the eldest male child (i.e. the head of the household after his father's death.)Palma remained in Leominster her entire life, as did many of her children. I have been able to trace them back to Clemente's father in Italy (one of those EUREKA!!! moments) and hope that you may actually fill in some blanks for me.
p.s. my email is Chihawk30@hughes.net