I am not sure of much about Giovanna Braida Perino. There were no Braidas listed in the records at all and I couldn't locate a family by that name in the census records. I am currently indexing the Calaveras County probate records and did see one for Govanna "Josephine" Perino dated 1928 that is an "incompetency" probate. It may be Antonio's wife. It is probate # 1344 in probate box 77 at the county archives.
Also, I forgot to tell you that Edward Purdy, father of Rose, died by suicide in 1899.
I will check the index cards at the archives next week and see if the Purdy cards show anything helpful