Sorry, I should have included more information.I will put it on the site because it may have more general interest.
First, the census records for Abram Dokey:
New York, Monroe County, Greece Township, 2-3 September 1850, p. 149 (side 297), lines 40-42, p. 149 (side 298), lines 1-9, National Archives Microfilm M432, reel 529.
Line 2 p. 149 (side 298) has Abraham Doka age 25 Laborer b. in Canada
New York, Monroe County, Parma Township, 22 July 1860, p. 748 (p. 26 written by hand),lines 16-22, National Archives Microfilm M653, roll 785.
Line 16 has AbrahamDoker age 32 Farm Laborer b. inLower
Canada (Listed by Ancestry.com as Daker and Dokey).
Michigan, Kalamazoo County, Kalamazoo, 6 June 1870, p. 120 (21 written by hand),lines 9-19, National Archives Microfilm M593, roll 680.
Line 9 has Doky, Abram age 49 Farm Laborer b. inCanada
Michigan, Allegan County, Lee Township, 18 June 1880, p. 361A, lines 37-47, National Archives Microfilm T9, roll 569.
Line 37 has Dokey, Abram age 60 farmer b. Canada, parents, too.
Next, the census records for Stephen Dokey:
New York, Monroe County, Greece Township, 1840, p. 244,line 4, National Archives Microfilm M704, roll 297.
Stephen Ducate [could be Stephen Dokey], 3 males under 5
[possibly John (5), Edward (3), and Emery (1)], 1 male 5 to 10 [possibly David (8)], 1 male 20-30 [This would have to be
Stephen], 1 female 5-10 [possibly Almina (8)], 1 female 20-30 [This would have to be Elizabeth].
New York, Monroe County, Greece Township, 3 September 1850, p. 149, lines 10-17, National Archives Microfilm M432, reel 529.
Line 10 has Stephen Dokee age 42 Laborer b. in Canada
Michigan, Cass County, Mason Township, 25 June 1860, p. 112,
lines 22-29, 26 June 1860, p. 117, lines 26-33, National Archives Microfilm M653, roll 541.
Line 28 has Stephen Dokey age 65 Laborer b. in Canada.
Summary with estimated birth years for Abram:
Census year: 1850 birth year: 1825
Census year: 1860 birth year: 1828
Census year: 1870 birth year: 1821
Census year: 1880 birth year: 1820
Summary with estimated birth years for Stephen:
Census year: 1840 birth year: 1810-1820
Census year: 1850 birth year: 1808
Census year: 1860 birth year: 1795
If we take the extremes for their years of birth, then we get the differences in their ages varying from zero to 33.However, the extremes are very unlikely.In particular, 1795 is a very unlikely year of birth for Stephen.Also, 1820 is a very unlikely year of birth for Stephen.1810 is a more likely year of birth for Stephen.If we keep the extremes for the year of birth for Abram, we get the differences in their ages varying from 10 to 18.If we take the upper limit for the year of birth for Abram, then the father-son relationship is possible,but that seems unlikely.The year of birth of Abram is more likely between 1820 and 1825.That puts the difference in their ages between 10 and 15.A father-son relationship would be possible, but unlikely.I think it is more likely that they are brothers.
A further point:We do not know where Abram was in 1840.It is unlikely that he was with Stephen (Ducate), because the other known children are accounted for according to their ages.If Abram had been born in 1828, he would be only 12 in 1840.He would have to be with a family (possibly still in Canada).