Alfred Blair Sedgwick  [parents unknown]     This family at SedgwickUK.org
b. abt 1817 or abt 1821, Kennington, Surrey, England2,4a
d. bet 1870 - 1880, [New York]1
m1 1840, England, Harriott Newton4b
m2 1847, England, Sophia Julia Bell4a
immigrated 1851 to New York2

Sophia Julia Bell  [parents unknown]
b. abt 1821, England2

Census records:

1860 NY Kings, Brooklyn
1870 NY Kings, Brooklyn
Widow Sophia:
1880 NY Kings, Brooklyn

Alfred B Sedgwick and family arrived in New York aboard the ship Margaret Evans on October 18, 1851.

Alfred had a brother George W Sedgwick, b. circa 1813 Kennington, Surrey, England4a

Children of Alfred Blair Sedgwick and Harriet Newton:

Harriott Margaret Louisa Sedgwick4a
  b. 1844, England1,2,4a
  m. abt 1865, Ormsby Hudson1
Alfred Charles Sedgwick2,4a
  b. November 1845, Lambeth, Surrey, England1,2,4a
  m. June 16, 1875, Dearborn County, Indiana, Katherine Ann Paramore1,6

Children of Alfred Blair Sedgwick and Sophia Julia Bell:

Sophia Ellen Sedgwick2
  b. 1848 St Pancras, Midddlesex, England1,2,4c
  m. abt 1868, [Brooklyn, Kings, New York], John Day1
Robert Bell Sedgwick2
  b. October 11, 1849, St Pancras, Midddlesex, England2,4c,5
Julia H Sedgwick
  b. abt 1853, [Brooklyn, Kings,] New York1
George F Sedgwick
  b. abt 1856, [Brooklyn, Kings,] New York1
  d. bet 1860-1870 [Brooklyn, Kings, New York]1
Florance C Sedgwick
  b. abt Feb 1859, [Brooklyn, Kings,] New York1
  d. bet 1860-1870 [Brooklyn, Kings, New York]1

Daughter Sophia married a John Day and appears with his family in the 1870 Census. They had a son Robert F Day, born about 1869, who appears with his widowed grandmother Sophia Sedgwick in the 1880 census. Did daughter Sophia die between 1870 and 1880?

Descendants / Researchers:

Martha Sedgwick
Alfred B / Robert B / Robert B Jr

Have more data? genealogy@sedgwick.org
Sources (all sources for this family listed here):

1. Census records, any of those indicated.

2. New York Passenger Lists, 1851-1891
an Ancestry.com database
Manifest of ship Margaret Evans upon arrival New York, October 18, 1851

3. Descendant or Researcher of this Family
a. Martha Sedgwick, granddaughter of Robert B Sedgwick, Jr.

4. SedgwickUK.org, by Nicky Cunningham
a. Web page for this family: Alfred Blair Sedgwick and a linked page
b. Transcript of Sedgwick Entries in English Marriage Registers – 1837 TO 1846
these records:
[name]PERIODDISTRICTIGIPARTNERPARISHDATE
ALFRED BLAIR SEDGWICKDecember 1840St Jas Sq WestYHarriet NewtonWestminster (M147517)23/12/1840
c. Transcript of Sedgwick Entries in English Birth Registers – 1847 TO 1850
these records:
[name]PERIODDISTRICTIGIFATHERMOTHERPARISH
SOPHIA ELLEN SEDGWICKMarch 1848St PancrasYAlfred Blair SedgwickSophia JuliaSt Pancras (C047935)
ROBERT BELL SEDGWICKDecember 1849MaryleboneYAlfred Blair SedgwickSophia JuliaSt Pancras (C047935)

5. Parish registers of St. Pancras Old Church, 1660-1916 Church of England
LDS Microfim #0598168, extracted recordes viewed at FamilySearch.org
this record:
  ROBERT BELL SEDGWICK
  Birth: 11 OCT 1849
  Christening: 01 JAN 1850 Old Church, Saint Pancras, London, England
  Father: ALFRED BLAIR SEDGWICK
  Mother: SOPHIA JULIA

6. Indiana Marriage Collection, 1800-1941
an Ancestry.com database
this record:
Spouse 1Spouse 2Marriage DateCounty
Anna C ParamoreAlfred C Sedgwick16 Jun 1875Dearborn
Stephen ParamoreKatharine Ann Richardson27 Dec 1835Ripley

7. Records of the Delta County (Michigan) Genealogical Society
a. Lakeview Cemetery, 2110 3rd Avenue South, Escanaba, Michigan
this record:
DeceasedFatherMotherCo BookFuneral HomeBloc Lot GravSexBorn DMYDied DMYCommentsDeath Age DMY
Phillips Mrs AndrewHudson OSedgirich, HenriettaB193AL000 00 J00F21 11 187321 11 1910Mrs AndrewCan0 0 37
b. (Delta County, Michigan) Marriages 1862-1927
this record:
NameSpouseMarriage DateBook & Page
Phillips, AndrewArmstrong, Christy2/24/12B344

8. Westchester County [New York] Archives
Marriage Records, 1908-1930, Personal Name Index
this record:
LastNameFirstNameCertificateNoYear
SedgwickRobert93021912
HetzelEdith93021912