Jane A Sedgwick  [George Sedgwick / Margaret Unknown]
b. July 1847, England1
d. aft 1900, [Tennessee]1
m. February 3, 1862, Knox County, Tennessee, T P McNichols2 (Book 2 page 185)

T P McNichols  [parents unknown]
b. abt 1830, Ireland1
d. bet 1870 - 1880, [Tennessee]1

Census records:

1860 TN Knox, District 1
1870 TN Knox, Knoxville
1880 TN Knox, Knoxville
1900 TN Knox, Knoxville
1920 TN Knox, Knoxville

Children:

Richard T McNichols
  b. abt 1862, [Knoxville, Knox] Tennessee1
Charles H McNichols
  b. abt 1865, [Knoxville, Knox] Tennessee1
  d. aft 19001
  m. February 5, 1890, Sadie M Batham2 (Book 8, page 146)
G Edward McNichols  (George?)
  b. August 1869, [Knoxville, Knox] Tennessee
  d. apparently 1911, [Knoxville] Knox, Tennessee

I cannot determine from the census records the true birthdates of these children. Their ages do not agree from decade to decade, and even in the 1900 census when Charles gives a birth date of October 1862, there is reason to believe that he is untruthful to hide the fact that his wife is older than he. I can't find Richard anyywhere in the US in 1900.

There appears to be an Edward McNichols and G Edward McNichols in Knox County at this time. Ed McNichols died in Knox County in 1910. George E McNichols died in Knox County in 1911.

Sources and notes:

1. Census records, any of those indicated.

2. Marriage Records, Knox County, Tenenssee
Filmed on LDS Microfilms 1020950 (Index), 102.951 (Vols 1-5) and 1020952 (Vols 6-8)
extracted records online at http://www.rootsweb.com/~usgenweb/tn/knox/knoxvital.htm
These records:
GroomBrideDateBook/Page
MCNICHOLS, T PSEDGEWICK, Jane A03 Feb 18632-185
MCNICHOLS, Charles HBATHMAN, Sadie M05 Feb 18908-146

3. Tennessee Death Index 1908 - 1912, Tennessee State Library and Archives
available online at http://www.state.tn.us/sos/statelib/pubsvs/death2.htm
These records:
NameCountyYearRecord Number
McNichols, George EKnox191148345
McNichols, EdKnox191050926

Questions? Have more data? genealogy@sedgwick.org