According to his Washington State death record, John was the son of John D. Agnesani. His wife was named Marion.
The following comes from the Washington State Digital Archives website:
"Collection: King County Clerk, Naturalization Records, 1906-1928 County: King Name: John Baptiste Agnesani Naturalization Id: 6751 County: King Document Type: Petition for Naturalization Volume: 23 Document Number: 5615 Country Of Origin: Villaminozzo, Italy Entry To Us Date: 11/18/1904 Date Of Document: 2/25/1924 Spouse Name: Marianna Childrens Names: Anna; John; Matilda; Nella; Pietro"
In his WWI Draft Registration Card, John lived in Renton with his wife "Maryanna Agnesani". He worked as a grocery clerk for Lon D'Laurenti in Renton. The card was dated 9/12/1918.