Hi, I looked through all Censuses but only found part of the family living in 1900 in Red Bluff. Lazaro Chavez, b. CA Dec 1869, marr 2 yrs, laborer planing mill. Matilda, wife, b. CA Dec 1874. Benjamin [Benito], brother b. March 1874, CA, laborer planing mill.
The State of California required death certificates in 1905. Therefore, you'll have to contact the Tehoma County Recorder, co.tehama.ca.us/ to see if they have their informational death certificates.I don't know if they'll search for a broad range of death dates or not.
After you receive copies of the death records, then you can request a copy of their obituaries. There is an obituary volunteer for Tehama Co. at freepages.genealogy.rootsweb.ancestry.com/~obitl/volca.html Scroll Down to Tehama Co. and choose Robin. Successful Searching!