The Tulare County Library has an great Genealogy Room and they are working with the Rootsweb-USGenWeb Project Tulare County, California webpage coordinator. As for your Joseph L. Caldwell, below is what I found on-line. By the way please reread your message before you post it as you have him just living for 3 months, July 1855 to Oct. 1855. One time I went shopping after doing research and wrote the date on my check as 1804, boy did I get a strange look from the cashier as she asked me to correct it.
California Death index has a Joseph Lee Caldwell born July 2, 1885 in Arkansas died October 14, 1957 in Tulare Co. California. Mother's maiden name is Colburn. http://vitals.rootsweb.com/ca/death/search.cgihttp://vitals.rootsweb.com/ca/death/search.cgi
1900 Arkansas, Montgomery Co. Arkansas: Caldwell, Theodore J. b. Feb. 1863 age 37 married 13 yrs b. MO/father-NC/mother-IN Caldwell, Louisa J. wife b. Apr 1870 age 30 married 13 yrs-had 7 children/6 living b. LA/father-AL/mother-AL Caldwell, Joseph L. b. July 1885 age 14 S b. AR/f-MO/m-KS Caldwell, Sarah V. b. Feb 1890 age 10 S b. AR/f-MO/m-AR Caldwell, Jessie F. Mar 1892 8 S AR/MO/AR Caldwell, Winnie B. Nov. 1893 6 S AR/MO/AR Caldwell, Laura J. June 1895 4 S AR/MO/AR Caldwell, Etna June 1899 11 months S AR/MO/AR Caldwell, Sarah -mother- Feb. 1822 78 Wd had 9 children/ 3 children livivng b. IN/IN/IN
As you can see Louisa J. is not Joseph's mother as he is 14 and his father had only been married to her 13 yrs. Louisa lists she had 7 children and only 6 are living at the time of the census. With Joseph there is 7 children total listed. Joseph has recorded his mother was born in Kansas when Louisa is born in LA. As to why the census taker lists Arkansas as the state the other 6 children's mother was born instead of LA is anybody's guess.
1910 OK McIntosh Co. Beck Twsp has Theodore J. Caldwell has recorded he was married twice. Louisa J. records having 10 children with 8 living-two children born after 1900 census are Mamie age 6 and George E. age 3.
WWI Oklahoma Draft cards 1917-1918 -Joseph Lee Caldwell born July 2, 1885, age 33, living in McIntosh Co. OK, nearest relative Annie Caldwell-- height-5'9", build med, eyes-brown, hair-black
1920 OK McIntosh Co. has Joseph Caldwell with wife Annie and 6 children.
Hope this gives you what you need for now. There is a Gedcom on Ancestry for Theodore J. Caldwell and Louisa J. Hill and they list Joseph L. as being "their" oldest child. There is a post-em note that says Joseph's wife name is Annie Sisk. I did a post-em with the information I have here.