I found an older brother of Vincenzo's
Ufficio Leva della Provincia di Cosenza, Enlistment year 1880.Volume number 169,
document number 27 page 177 section c
Alessandro Avolio, enlisted on --/--/----
born on 12/11/1879 to FAGNANO CASTELLO
son/daughter of Gaetano Avolio and of Francesca Porcella
There is another entry for him with the surname misspelled as Arolio
This may or may not be your Francesca
Ufficio Leva della Provincia di Cosenza, Enlistment year 1860.Volume number 59,
document number 29 page 232 section a
Francesco Porcella, contadino enlisted on 15/10/1880
born on 30/05/1859 to FAGNANO CASTELLO
son/daughter of - - and of Francesca Porcella
http://88.59.143.158/ascs_web/index.faces
Erudita