Robert Blair Sedgwick  [Robert Bell Sedgwick / Henrietta A Rogers
b. March? 1885, [Brooklyn, Kings,] New York1
m. 1912, Westchester County, New York,8 Edith D Hetzel1,3a

Edith D Hetzel  [parents unknown]
b. August 25, 1887, New York1,3a
d. October 1975, Mohegan Lake, Westchester, New York3a,9

Census records:

1900 NY Kings, Brooklyn
1910 NY Kings, Brooklyn
1920 NY Kings, Brooklyn
1930 NY Westchester, Yorktown

Children:

Robert Blair Sedgwick, Jr1
b. 19 June 1913, [Brooklyn, Kings,] New York1,3A,9
d. June 5, 2004, Orleans, Barnstable, Massachusetts3A,9
William C Sedgwick 1
b. July 12, 1919, [Brooklyn, Kings,] New York1,3a
Helen E Sedgwick 1
b. abt 1920, [Brooklyn, Kings,] New York1

Good chance that this Social Security Death Index record is son Robert:

Sources:

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.

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

9. Social Security Death Index
accessed at Ancestry.com
these record:
NameBirth DateDeath DateLast Residence
Edith Sedgwick25 Aug 1887Oct 1975Mohegan Lake, Westchester, New York
Robert Sedgwick19 June 19135 June 2004Orleans, Barnstable, Massachusetts