James, I have found a Sigmond Janas listed on the 1930 California census, San Francisco, San Francisco (Districts 251-409), district 308 [image 50 at ancestry.com]
Sigmond Janas, head, age 30, married age 23, CA GER CA
Grace Janas, wife-h, age 32, married age ?, CA CA CA
George Janas, son, age 6, CA CA CA
Sigmond Janas, son, age 6, CA CA CA
Emma Janas, cook, age 35, single, UT SWITZ SWITZ
I found Sigmond Joseph Janas listed in California deaths. He was born 19 Apr 1923 in CA and died 10 May 1993 in Mendocino, CA. He is probably one of the twin sons listed for Sigmond in 1930.
Also in California Death's: Maryagnes Janas Markwith, born 7 Aug 1890 in CA, died 25 Jun 1958 in Inyo, CA. Mother's maiden name, Ellett, father's surname Janas.
I am wondering if John Benjamin and Mary Ann (Bracelin) Ellett's daughter, Clara Ellett, may have married a Janas and that Maryagnes was her daughter. Clara could also be the mother of the Sigmond Janas listed above (born about 1900). I have requested an obituary lookup from a volunteer at RAGOK for Maryagnes, maybe her parents will be listed.