I found your husband's family in the marriage and baptism extractions. Matthei Marimberga married Rosaria Candela (spelled with and "a", not "o", and only one "l") on November 1, 1891. Six children are listed in the baptism records, all sons: Damiano Pacifico (1892); Damiano (1895), Damiano (1896), Giuseppe (1899), Giacomo (1901) and Matteo (1904). Its likely, following tradition, that the first two Damiano's died young and so that the next born after those deaths were also named Damiano,, with the last surviving. Note that Pacifico was the name of Matthei's father.
I suspect that Giacomo may by your "elusive Jack". His specific baptism date is November 1, 1901.