Richard Sedgwick   [William Sedgwick / Elizabeth Unknown]
b. November 1859, Wisconsin1
m. abt 1885, [Wisconsin], Minnie Martin1

Minnie Martin  [Edwin Martin1 / Unknown]
b. October 1864, Wisconsin1

Census Records:

1860 Wisconsin, Waukesha, Merton
1870 Wisconsin, Waukesha, Merton
1880 Wisconsin, Waukesha, Merton
1900 Wisconsin, Waukesha, Merton
Minnie as child:
1880 Wisconsin, Winnebago, Omro

Children:

Verna Sedgwick
  b. February 1886, Wisconsin1
William Sedgwick
  b. March 1890, Wisconsin1
Clarence R Sedgwick
  b. Sept 20 1894, Wisconsin1,2
Isabell Sedgwick
  b. September 2, 1897, Wisconsin1,2
Earl Sedgwick
  b. January 18, 1904, Wisconsin5a

This GenForum message tells of Isabelle's descendants.

I suspect that son William married Isabel Kaufman and appears 1920 Wisconsin, Waukesha, Merton

Sources and notes:

1. Census records, any of those indicated.

2. Wisconsin Births, 1820-1907
an Ancestry.com database
These records:
NameBirth DateCountyReelRecord
Clarence R Sedgwick20 Sep 1894Waukesha0299002561
Isabelle Sedgwick02 Sep 1897Waukesha0300001149

5. Genealogy.com Message Boards (user submitted data)
a. Salter Forum Message 739, posted by Michelle