I checked the census records for you......

BLANKENSHIP, JOHN W (1900 U.S. Census)
TEXAS , HUNT, 5-PCT
Age: 79, Male, Race: WHITE, Born: AL
Series: T623 Roll: 1648 Page: 51......

Household 72 72 John listed as born Nov 1821 age 78
Ann E. listed as b. Nov 1836 but age 73 (The 1836 is clearly written but obviously incorrect) She had birthed 11 children but only 4 were living.....

Household 73 73 consisted of son Robert b. Dec 1868 and wife Loutishie b. Feb 1871 Married 10 yrs. 1 child born and still living. This child is a daughter, Jessie O. b. Jun 1890 age 9.......

Ann E. died 1902
John W. died April 1910 but official census day is 1 Jun 1910 so John is not found......

Robert L. listed 1910 and 1920 in Lamar County.
I did not find him in 1930.....

BLANKENSHIP, ROBERT L (1910 U.S. Census)
TEXAS , LAMAR, 3-PCT
Age: 41, Male, Race: WHITE, Born: TN
Series: T624 Roll: 1572 Page: 102.......

BLANKENSHIP, ROBT L (1920 U.S. Census)
TEXAS , LAMAR, PARIS
Age: 52, Male, Race: WHITE, Born: TN
Series: T625 Roll: 1827 Page: 151........

I can send you the images if you do not have access to Heritage Quest........

Board doesn't seem to believe in paragraphs, so I added a few dots [.....] to designate information breaks.Your posting seems to have paragraphs so mine may end up looking like paragraphs with trailing dots. But it didn't have paragraph breaks in the preview.