"New York, New York City Marriage Records, 1829-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:249N-B5C : 20 March 2015), Gilbert Acker and Jane Bown, 02 Feb 1872; citing Marriage, Manhattan, New York, New York, United States, New York City Municipal Archives, New York; FHL microfilm 1,561,755.
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MCB6-48Q : 9 November 2014), Gilbert Acker in household of John Mc Niff, New York City, ward 16, New York, New York, United States; citing family 639, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
"New York State Census, 1855," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K676-P52 : 19 November 2014), Gilbert Acker in household of Cornelious Acker, E.D. 6, Ward 16, New York City, New York, New York, United States; count clerk offices, New York; FHL microfilm 1,018,661.
It may be possible to confirm family relationships with Gilbert by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share DNA with Gilbert: