The following was posted previously on the internet (Ancestry message board)
1900 Fremont, Santa Clara, California * Mathew O'Conner 60, b Jan 1840 in Canada, to US 1854, married 1878, father b Ireland, mother b England; farmer * Mary A O'Conner 40, born Feb 1860 in Ireland, to US 1874; has had 9 children * Mary M O'Conner b Oct 1880 CA (gone from home by 1920) * Nellie C O'Conner b Mar 1883 CA (gone from home by 1930) * Jennie/Jane F O'Conner b Aug 1884 CA (gone by 1930) * Annie T O'Conner b Aug 1886 CA (still at home 1930) * James O'Conner b July 1888 CA * Nessie E O'Conner b Nov 1890 CA (still at home 1930), bookkeeper dept store * Kathryn "Kate" J O'Conner b Oct 1892 CA (still at home 1930) supv telephone co Mabel C O'Conner b Mar 1895 CA (still at home 1930) bookkeeper oil co Genevieve A O'Conner b Oct 1897 CA (still at home 1930) bank stenographer
1910 Matthew has apparently died previously; he is missing 1910 - all children still in household in 1910 1920 Mary and co. lived in San Jose 1930 Mary and co. livedin San Jose
NATURALIZATION Name: Matthew O'Connor Year: 1880 Place: Santa Clara Co., California Source Pub. Code: 7894.4 This comes from the Santa Clara County, California "Great Register" of voters, 1890, page 151.
Apparently Ann T, Nessie Elizabeth, Mabel C, Genevieve A, and Kate J never married (or at least, each died with surname O'Connor).
DEATH Ann T Oconnor Birth: 01 Aug 1887 Birth Place: California Died: 28 Sept 1973 Death Place: Santa Clara --parents not named on CA death index
DEATH Name: Nessie Elizabeth Oconnor ( = Anastasia E) Social Security # - NA Birth: 11 Nov 1891 Birth Place: California Death: 17 Oct 1954 Death Place: San Francisco Mother's Maiden Name: Bradley Father's Surname: Oconnor
DEATH Kathryn "Kate" J O'Conner Birth: 21 Oct 1892 Birth Place: CA Died: 01 Feb 1972 Death Place: Santa Clara --parents not named CA death index
DEATH Name: Mabel C Oconnor Social Security # - NA Birth: 28 Mar 1895 Birth Place: California Death: 02 Apr 1982 Death Place: Santa Clara Mother's Maiden Name: Bradley
DEATH Name: Genevieve A Oconnor Social Security # - NA Birth: 26 Oct 1898 Birth Place: California Death: 07 Apr 1943 Death Place: Santa Clara Mother's Maiden Name: Bradley Father's Surname: Oconnor
WORLD WAR I DRAFT REGISTRATION James Jospeh O'Conner born 17 July 1888 natural born in Mountain View CA registered for the WW I draft in San Jose CA, single, blacksmith. Was still living at home in the 1930 census, house plumber in 1930