Henry and Eliza (Nulty) Johnston Rawdon, Quebec and Renfrew, Ontario Canada

I am looking for the parents of Henry Johnston and Elizabeth Nulty.
I have found a Henry Johnston who died on 5 Dec 1838 in Rawdon, Quebec and in the
1851 Rawdon, Quebec census there is a Johnston family, Rebecca (Scanlon) Johnston  ( widow) with her  children. This could be my Henry's family. 

My Henry is in all the following census .  1851 Rawdon Quebec, 1861Rawdon Quebec, 1871 Renfrew Ontario, 1891 Renfew Ontario.  In census he  says he is Church of England, Anglican orProtestant.  My Henry Johnston family is as follows:

1 Henry Johnston b: Abt. 1823 in Ireland,   d: 1900 in Pembroke, Ontario, Canada
  
  .. +Elizabeth Nulty b: Abt. 1822 in Ireland m: Abt. 1840 in Rawdon, Montcalm, Quebec, Canada d: 1892 in  Pembroke, Ontario, Canada
 
  ... 2 Henry Johnston b: 16 Nov 1841 in Rawdon, Montcalm,   Quebec, Canada d: 01 Apr 1919 in Tacoma, Pierce,   Washington
  
  ....... +Elizabeth McConnell b: 03 Apr 1848 in Pembroke, Allumette Island, Pontiac, Quebec, Canada m: 25 Apr > 1867 in Westmeath, Renfrew , Ontario, Canada d: 05 Jun 1915 in
  Whytewold Beach, Manitoba
  
  ... 2 Elizabeth Johnston b: 1844 in Rawdon, Montcalm, Quebec, > Canada d: 1931
  
  ....... +Nelson Anderson 
  
  ... *2nd Husband of Elizabeth Johnston:
  
  
  ....... +Mr. Nelson 
  
  ... 2 Catherine Johnston b: 01 Sep 1846 in Rawdon, Montcalm, > Quebec, Canada 
  
  ....... +John Bromley 
  
  ... 2 John Johnston b: 1847 in Rawdon, Montcalm, Quebec, > Canada 
  
  ... 2 William N. Johnston b: 16 Nov 1852 in Rawdon, > Montcalm, Quebec, Canada 
  
  ....... +Bridget Sheedy b: 04 Aug 1849 in Osceola, Renfrew, > Ontario m: 1888 in Renfrew, Ontario, Canada d: 07 Jul 1921 in > Macklin, Saskas
  
  ... 2 Mary Jane Johnston b: 24 Mar 1856 in Rawdon, Montcalm,> Quebec, Canada  > 
  ... 2 Frances Johnston b: 31 Jul 1858 in Rawdon, Montcalm,> Quebec, Canada d: 12 Dec 1934 in Pembroke, > Renfrew, Ontario, Canada
  
  ....... +Montgomery 
  
  ... 2 George Albert Johnston b: 1859 in Rawdon, Montcalm, > Quebec, Canada 
  
  ... 2 Ophelia Emily Johnston b: 20 Apr 1862 in Quebec > d: Aft. 1939
  
  ....... +Samuel Brannan b: 18 May 1848 in Wilberforce, Canada > m: 01 Nov 1880 in Renfrew, Ontario, Canada d: 30 Dec 1906 in > Renfrew, Ontario, Canada
  
  ... *2nd Husband of Ophelia Emily Johnston:
  
  ....... +Henry Chapman b: Abt. 1872 in England m: 11 > Dec 1923 in Frontenac d: 09 Apr 1926 in Renfrew, Ontario, Canada