I just looked over my Brockwell records and came across my notes on the 1870 and 1880 Obion Co. census. I may have the name your were searching for.
William S. Brockwell and his wife (and 1st. cousin) Martha A. Brockwell had a son John T. Brockwell , but BOTH census show him born about 1866. Is the birth year you gave as 1868
absolutely known as correct ?
The Census are as follows ...
1880 Harris Station Dist # 1 OBION COUNTY Tn.
HH#219 William S. Brockwell 46 b. Tn f. Va. m. Va.
Martha A. Brockwell 40 b. Tx f. Va. m. Tn.
(Martha's father was John Brockwell, William's uncle who died in 1850 Her mother was Nancy Hogan who married John in Obion county Jan 16 1839 They moved to Texas the before Martha was born in 1840 Then moved back to Tn.before Martha's bro. John was born in 1843)
John T. Brockwell 14 b. Tn. f. Tn. m. Tx.
William Brockwell 11 b. Tn. f. Tn. m. Tx
Laura Brockwell 8 b. Tn. f. Tn. m. Tx.
William was the son of Edwin Thomas Brockwell and Sarah (Sallie) ANDREWS (?) Brockwell
William was a CONFEDERATE soldier in Co. I 47th. Tenn. Inf.
and was given a Confederate pension ( Both records contain interesting personal info.
The 1870 census is essentially the same info.
HH# 4 William Brockwell 32 b Tn. ( he was actually 34)
Martha Ann Brockwell 30 b. Tx
John Brockwell 4 b. Tn
William Brockwell 1 b. Tn.