John moved to Texas about 1860.

1. From the 1880 US Census:
IVY, John S. entry, 1880 Fed Census, Population Schedule, Precinct No. 1, Shackelford Co., Texas, Enumeration District 178, Supervisor’s District 3, Sheet 454B, Page 6, Lines 34-42, dwelling 49, family 51, Micropublication T9, Reel 1326,
National Archives, Washington, DC
Page 6
Line 34, IVY, John S., W, M, Age 40, Married, Farmer, PoB- Illinois,
PoB Fa. - Illinois, PoB Mo.- Illinois.
Line 35, Sarah E., W, F, Age 36, Married, Keeping House, PoB- Indian Territory,
PoB Fa. - Tennessee, PoB Mo.- Tennessee.
Line 36, ????, W,M, Age 13, Son, Single, Works on farm, Cannot write, PoB- Texas,
PoB Fa.- Illinois, PoB Mo.- Indian Territory.
Line 37, Olive, W, F, Age 10, Daughter, Single, Cannot read or write, PoB- Texas,
PoB Fa.- Illinois, PoB Mo.- Indian Territory.
Line 38, Effie, W, F, Age 7, Daughter, Single, PoB- Texas,
PoB Fa.- Illinois, PoB-Mo.- Indian Territory.
Line 39, Coorie M. ??, W, F, Age 6, Daughter, Single, PoB- Texas,
PoB Fa.- Illinois, PoB Mo.- Indian Territory.
Line 40, Thomas C., W, M, Age 4, Son, Single, PoB- Texas,
PoB Fa.- Illinois, PoB Mo.- Indian Territory.
Line 41, Elsie, W, F, Age 2, Daughter, Single, PoB- Texas,
PoB Fa.- Illinois, PoB-Mo.- Indian Territory.
Line 42, John, W, M, Age 5/12, Son, Single, PoB- Texas,
PoB Fa.- Illinois, PoB-Mo.- Indian Territory.
From this information
(1) Sarah E. born in Indian Territory (Oklahoma) Abt. 1844.
(2) They were in Texas by 1867
(3) The 2 oldest children had no schooling,
Parents may not have had schooling, Very likely Mother did not.
(4) School not in area.