Hi I am another California Mattos. My great grandfather was Manuel Francisco Mattos b:1861 in St. George, Azores. His parents were Eugene Azevedo Mattos and Catherine ?(unk).
He came to CA in 1880.
He died 1932 and is buried in the Lemoore Cemetery. When he died he was a dairyman and had several dairies in the San Joaquin Valley, which his sons managed.He had one in Pacific Grove, Montery Co. where he lived.His first marriage was to Jacoba Villa and his 2nd marriage was to Pelar Villa (a half sister to Jacoba).
My Grandfather, a decendant from his marriage to Jocaba, was Joseph Francisco Mattos and he married Mayme Marques of Salinas. Mayme's parents were Antone Souza Marques b:Azores(whaleman) and Mariana "Anna" Phillips (dau of Alexander J. and Mary Phillips)b:CA
My grandfather's brother Manuel married a Bettencourt. His half sister married a Silveria.
If this family sounds familiar I am happy to share any family information that I have.