"775. John 8 (Lester 7 Joseph 6 Joseph 5 Joseph 3 Joseph 2 William 1) born 1806; died 1862, Married Mary M. Anthony.
Lester A. b 1 Feb. 1836
William F. b 1845; m 1878, Julia Smith
Ella James W. Noyes, b 8 June 1844, s of William C. and Jane (Kenow) Noyes
John (Twin of Rufus)
John B. d.y.
From Troy Daily Times, Wednesday Afternoon, Feb. 4, 1863
—John Beardslee, for many years Superintendent of canal repairs, died suddenly at Little Falls, of apoplexy, on Sunday morning. His wife was awakened by his heavy breathing, and before she could summon help, he was dead.
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Beardsley Genealogy: The Family of William Beardsley, One of the First Settlers of Connecticut. Compiled and edited by Nellie Beardsley Holt and Charles Eleazer Holt. Published at West Hartford, Connecticut, 1951. John Beardsley is Holt Record #775, Pg. 311.
1840 US Census:Little Falls, Herkimer County, NY
1850 US Census: Little Falls, Herkimer County, NY, 29 Jul 1850 
New York, State Census, 1855: Little Falls, Herkimer, NY, E.D. 1, 12 Jun 1855
New York, Compiled Census and Census Substitutes Index, 1790-1890 : Citing 1860 Federal Population Schedule, John Beardslee, Little Falls, Herkimer County, NY, Pg. 568
↑ Sixth Census of the United States, 1840. (NARA microfilm publication M704, 580 rolls). Records of the Bureau of the Census, Record Group 29. National Archives, Washington, D.C.; Roll: 290; Page: 33; Image: 71; FHL microfilm: 0017190
↑ Also enumerated, wife, Eliza W. Beardslee, 39, born c1811 NY,
↑ Seventh Census of the United States, 1850; (National Archives Microfilm Publication M432, 1009 rolls); Records of the Bureau of the Census, Record Group 29; National Archives, Washington, D.C.; Roll: M432_512; Page: 232B; Image: 414
↑ Also enumereated, wife, Celanthy Beardslee, 44, born c1811 NY
↑ Jackson, Ronald V., Accelerated Indexing Systems, comp.. New York Census, 1790-1890. Compiled and digitized by Mr. Jackson and AIS from microfilmed schedules of the U.S. Federal Decennial Census, territorial/state censuses, and/or census substitutes
The question remains, who was his wife and mother of his children?
Holt lists 'Mary M. Anthony'
1850 US Census enumerates 'Eliza W. Beardslee', 39, born c1811 NY
New York, State Census, 1855 enumerates 'Celanthy Beardslee', 44, born c1811 NY (note same birthdate as 'Eliza').
The mystery deepens when you consider John's daughter, Anna Beach Beardslee. In both the 1850 Federal and the 1855 New York State census' Anna is identified by her given and apparently middle name "Anna Beach". There is an age gap between Anna and her brother Lester to their other siblings of about 10 years. The Holt genealogy lists a number of children who died young but provides no dates, and the two census records do not list the other children. The Holt genealogy also does not include Anna in the family of John B, Beardslee.
The census records show John B Beardslee's wife as "Eliza W" (1850 Federal) and "Celanthy" (1855 NY State). The 1855 census listing is very difficult to read, and the translation is undoubtedly in error. The Holt genealogy lists only a Mary M Anthony as John's wife.
The possibility of John having two wives may be worth investigating, and may explain the age gap of the siblings and the discrepancy of names on the censuses.
It may be possible to confirm family relationships with John by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
John Beardsley :
Family Tree DNA Y-DNA Test 500 markers, haplogroup I1-A4636*, FTDNA kit #B2385 +
Y-Chromosome Test 2270 markers, haplogroup I-A4636