Thanks to member #46981831 for sending the following proof that the headstone for Sybil has the wrong date of birth:

1910 Smith Co., TX jp 7
Oliver O King 45
Cacie King 24
Syble King 5
Alwyn King 3

1920 Upshur Co., TX jp 7
Oliver O King 50
Cecile King 35
Sybil King 16
Alvin King 13
Oliver King 7
Mary Lee King 4

U.S. City Directories, 1822-1995
Name: Cleo Johnston
Gender: Male
Residence Year: 1924
Residence Place: Dallas, Texas, USA
Occupation: Tr Driver
Spouse: Sybil Johnston
Publication Title: Dallas, Texas, City Directory, 1924

U.S. City Directories, 1822-1995
Name: O Cleo Johnston
Gender: Male
Residence Year: 1927
Street address: 2710 Grafton
Residence Place: Dallas, Texas, USA
Occupation: Gas Ftr Gas Appliance Serv Corp
Spouse: Sybil Johnston
Publication Title: Dallas, Texas, City Directory, 1927

1930 Dallas Co., TX Dallas dist 20
6009 Velasco
Johnston, Ollie C head rent $25/mo 29 age first mar 22 TX/TX/AR salesman heaters-gas wage
Sybil wife 26 age first mar 19 TX/MS/TX
Billee Frances dau 5 TX/TX/TX
King, Oliver lodger 17 TX/MS/TX clerk general store wage
Alwyn lodger 23 carpenter bridge wage

1940 Dallas Co., TX Dallas 255-53
200 Fulton St. Juliette Fowler orphan home
Johnston, Sybil lodger 36 divorced H4 b. Tx same place 48 hrs wk dietician orphan home pw 52 wks/yr $300

Texas, Divorce Index, 1968-2011
Name: Sybil L Haskew
Estimated birth year: abt 1904
Age: 67
Spouse's Name: Emmett O Haskew
Spouse's Age: 80
Marriage Date: 12 Aug 1950
Number of Children: 0
Divorce Date: 12 Jul 1971
Divorce Place: Dallas, Texas, USA

Texas Death Index, 1903-2000
Name: Sybil Haskew
Death Date: 30 Jul 1987
Death County: Tarrant
Gender: Female

Social Security Death Index:
Name: Sybil Haskew
Last Residence:
76010 Arlington, Tarrant, Texas, USA
BORN: 21 Aug 1903
Died: Jul 1987
State (Year) SSN issued: Texas (Before 1951)