Sources:

1. Records of descendants/researchers of this family
a. John Warren, descendant of Robert Sedgwick's daughter Margaret Ann
    John used to have a website, but it has disappeared
b. Rachel Sharp, descendant of Robert Sedgwick's daughter Margaret Ann
c. Selma Sedgwick, wife of a grandson of Robert Sedgwick's son Matthew
d. Peggy Alsobrook, ggdau of Jonathan Winfield Groves and Sarah Coryell
e. Barbara Sedgwick, daughter of Owen Sedgwick
f. Charles Weller Sedgwick, son of Charles Leo Sedgwick
g. George Leibert Sedgwick, grandson of Leibert Dewitt Sedgwick
h. Robert "Bob" Geer, son of Elizabeth F. Groves and Euwell Eugene Geer

2. Census records, any of those indicated.

3. Tombstone of Anna Sedgwick, inscribed Jan 18, 1781 - Mar 12, 1843
Brandywine Twp, Shelby, Indiana, Brandywine Cemetery

4. Illinois Marriages to 1850, Illinois Marriage Records, 1851-1900
two Ancestry.com databases
these records:
Husband Wife Marriage Date County ST
GROVES, JONATHAN CORYELL, SARAH 9 Mar 1848 Clark IL
SEDGWICK, GIDEON COALE, SARAH A 15 Nov 1860 Clark IL
SHOEMAKER, WASHINGTON PSTOGSDILL, LUCINDA<24 Aug 1862Clark IL
SEDGEWICK, JAMES R SHOEMAKER, LUCINDA W 18 Mar 1868 Clark IL
HON, GEORGE K SEDGEWICK, SARAH A 10 Nov 1869 Clark IL
GROVES, JONATHAN SEDGEWICK, SARAH E 29 May 1870 Clark IL
BENNETT, GILBERT J HAUGHN, SARAH ADALINE 1 May 1880 Clark IL
SALLA, ORVILLE C SEDRICK, SAMANTHA A 3 Nov 1880 Clark IL
SALLA, EDWARD C SEDGEWICK, ELENER L 21 Dec 1882 Clark IL
HARDIN, THOMAS J SEDWICK, OLLIE 24 Dec 1885 Clark IL
SEDGWICK, WILBUR D LANG, OPAL 10 Oct 1899 Clark IL

5. Family Data Collection - Births
an Ancestry.com database
this record:
NameFatherMotherBirth DateCountyState
Stogsdill, LucindaStogsdill, John MorrisHouston, Lydia1838DecaturIN

6. Genealogy.com World Family Tree Volume 11 Tree 3162
However, this tree was erroneous according to a descendant, so all references to it have been deleted.
this data: Alfonso L Groves b. February 22, 1871 d. July 4, 1926 m. Vinetta Net Pennington Vinetta Net Pennington [William Pennington / Elizabith Ann Sears] b. December 18, 1876 (parents' marriage and deaths listed at Whitewright, Texas) children: Roy Harold Groves Elizabeth Groves m. Robert Geer, child Robert Geer Jr Pennington Groves m. Pearl Price, children Ray Groves, Roy Groves m. Modean Martin

7. Grayson County TXGenWeb: Oak Hill Cemetery these records:
GROVES, A. L. 22 FEB.1871-4 JULY 1926 A MASON;
  HUSB. OF NETTIE WED 10 NOV.1901
GROVES, NETTIE PENNINGTON 18 DEC.1876-4 JUNE 1974
  WIFE OF A.L. DAU. OF BILL & BETTIE PENNINGTON

8. Texas Deaths, 1964-98
an Ancestry.com database
this record:
Groves, Nettie P, 04 June 1974, GRAYSON, F, WIDOWED

9. Records of Silverton Cemetery in Briscoe County, Texas
Silverton Cemetery Association, 2000
These records:
Sedgwick, Robert, 1844, 1926, Org.N.Side # 28, Sedgwick, R.
Sedgwick, Allie, 1840, 1931, Org.N.Side # 28, Sedgwick, R.
Sedgwick, Edna , 08/26/1877, 08/13/1913, Daughter of RS, Org.N.Side # 28, Sedgwick, R.
Sedgwick, Baby, 04/?/1906, 04/?/1907, Org.N.Side # 28, Sedgwick, R.

10. Family Data Collection - Marriages
an Ancestry.com database
note: this database is complied from a variety of records and may or may not be accurate.

11. Social Security Death Index

12. Draft Registration Card
a. WWI Draft Registration Card of Weller C Sedgwick, viewed online at Ancestry.com