Hi Ellen, An Edward N. Guilbert b. 10 Oct 1917, Placer Co. Mother=Mourier. Source: California Birth Index 1905-96, Ancestry.
A William B. Guilbert b 16 Jan 1919, San Joaquin Co. Mother's Maiden Name=Guilbert [mistake?], Source same as above.
An Elinor J. Guilbert b. 5 Aug 1920, Placer Co. Mother's Maiden Name=Mourier. Source: same as above.
A Grederic G. Guilbert, b. 26 Jan 1922, Placer Co. Mother's Maiden Nmae=Mourier. Source Same as above.
In 1930 the Guilbert family lived in Roseville, Placer Co., CA. Edward N. Guilbert, b. CA, 37, marr @ 24, car builder Pacific Fruit Express. Jennie L, wife, b. CA, 39, marr @ 26. William B., b. CA, 11. Elinor J. b, CA, 9. Fred G., b. CA, 8.
I think Edward N. Guilbert born in 1917 died before the 1930 Census. I couldn't find the family in the 1920 Census.
An Edward Nathan Guilbert b. 13 April 1892, Yreka, CA, Residence=Placer Co., CA filled out his World War II Draft card. Source: U. S. World War II Draft Registration Cards 1942, Ancestry.
A Fredrick George Guilbert b. 26 Jan 1922, CA died 10 Dec 1943, Sacramento. Mother's Maiden Name=Mourier. Father=Guilbert.
A Jenny Lillian Mourier Guilbert b. 19 June 1890, CA died 5 Dec. 1955, Place Co. Father's Surname=Mourier. Source: California Death Index 1940-97, Ancestry.
You can request a copy of her obituary from Random Acts Genealogical Kindness. Go to raogk.org/, read guidelines, choose California, choose Placer Co.
OR Contact Placer Co. Library, placer.ca.gov/Departments/Library/LibraaryOnlineCatalog.aspx .
A William B. Guilbert b. 16 Jan 1919, CA died 9 Sept. 1968, San Francisco Co. Mother's Maiden Name=Myers [mistake?]. Source California Death Index 1940-97, Ancestry.
You can request copies of their vital records from the Placer County Clerk-Recorder, placer.ca.gov/Departments/Recorder/Vital%20Records.aspx . Successful Searching!