San Diego Union, 9/22/1914 KNAPP- In this city, 9/21/1914, Mrs. Hannah Knapp, mother of Mrs. J. H. Kahle, Jr, and H. M. Knapp of San Diego, George R. Knapp of Vinton, IA, Francis F. Knapp of Los Angeles, E. W. Knapp of St. Paul, MN, S. E. Knapp of Hayden Hill, CA, and Clarence I. Knapp; a native of PA, 80?y 9m 27d.... Interment Auburn, IA.
1885 Ia State Census, Benton, Cedar, IA John Knapp 55 Hannah Knapp 54 Frances F Knapp 27 Everett Knapp 23 Clarance Knapp 15 Gertrude Knapp 10
1900 census, San Diego Ward 2, San Diego, California Hannah Knapp 69 Kahle Knapp 36 Gertrude A Knapp 25 Richard F Knapp 3 Francis C Knapp 9/12 
1900 census, Raton, Colfax, New Mexico C I Knapp 29 switchman RR Edith Knapp 27 Clarence Knapp 1 Hellen Knapp 3/12 [0
1910 census, San Diego Ward 2, San Diego, California Clarence I Knapp 39 Edith A Knapp 37 Clarence R Knapp 11 Helen E Knapp 10
Clarence bought property in La Jolla
1920 census, Los Angeles Assembly District 75, Los Angeles, California Edith A Knapp 48 divorced IA Helen E Knapp 19 NM
1920 census, Venice, Los Angeles, California Clarence Knapp 47 Fritzi Knapp 28 Rudolph Knapp 11
1930 census, Glendale, Los Angeles, California
Clarence K Knapp 39 NM Personnel Dir Dept Store owns $15000 house Lila V Knapp 31 Roland E Knapp 9 Robert T Knapp 6 Edith A Knapp 58 father Andrew J Talbot 80 father in law Margaret Talbot 75 mother in law
LA Times 4/23/1973 Knapp, Clarence R, beloved father of Roland E. Knapp and Robert T. Knapp, brother of Mrs. Helen Barker...Forest Lawn-Glendale.
California Death Index, 1940-1997 about Helen E Barker Name: Helen E Barker Social Security #: 548059878 Sex: Female Birth Date: 27 Feb 1901 Birthplace: New Mexico Death Date: 10 Dec 1977 Death Place: Santa Barbara
California Death Index, 1940-1997 about Lila Virginia Knapp Name: Lila Virginia Knapp [Lila Virginia Talbot] Social Security #: 555211634 Sex: Female Birth Date: 11 Mar 1891 Birthplace: Michigan Death Date: 10 Feb 1982 Death Place: Los Angeles Mother's Maiden Name: Whalen Father's Surname: Talbot