California Death Index:
Delma D. Knox b.9/28/1908 Texas d.4/16/1986 Shasta County, Father's surname Feltz, Mother's maiden name Stillwell
S/S#453-48-8071 issued Texas before 1951.
You can order a copy of the Social Security application form ($27) and it should list place of birth and parent names including mother's maiden.
1910 Oklahoma, Jefferson County, Waurika City, ED#157, Page 42A, 5/3/1910:
Benjamin S?. Feltz, 43yo, M2/7yrs, NC NC NC, Carpenter/House
Ida J., wife, 38yo, M2/7yrs, 4 children/4 living, TX AR TX
Idal?, daughter, 5yo, OK NC TX
continued next page.....
Delma D., daughter, 1yo, OK NC TX
Nora L. Warren, daughter, 30yo, M1/11yrs, AR NC TN
May E. (Warren), grandaughter, 10yo, OK TN AR
Gar??? (Warren), grandaughter, 7yo, OK TN AR
Opal (Warren), grandaughter, 5?yo, OK TN AR
Ruby E. (Warren), grandaughter, 5yo, AR TN AR
Benjamin ?. (Warren), grandson, 2yo, OK TN AR
Martha K. Trout, stepdaughter, 14yo, OK US TX