Get a genealogy progam.  I suggest Family Tree Maker.  Subscribe to ancestry.com.  Go to census records and California records.  FYI here is the family in 1930:      The 1930 Federal Census for Oklahoma, Creek County, Newby, ED 19-33, south side of Newby township, enumerated April 12, by Henry G. Davidson, lists: William Maxwell, 37, married age 21, born AR, parents born KY, a pumper, not a veteran; Elda, wife, 34, married age 17, born AR, parents born KY; Clyde, son, age 16, Robby, son, age 14, Thoral, son, age 13, Tirl T. son, age 11, Lensey G., son, age 8, Francis N, dau, age 6, Junius M, son, age 11 months, all children born OK, of parents b AR; m. Lavene, half sister, age 5 months. b OK.