I expect you have these marriages, but just in case:
009414-92 ( Oxford Co) John DUNN , 25 , farmer , North Oxford , same , s/o Michael DUNN & Catherine GOING? , married Honora Ann O'GRADY , 26 , Brantford , Ingersoll , d/o Patrick O'GRADY & Johanna LYNCH , witn: Jeremiah DUNN of Ingersoll & Johanna O'GRADY of Brantford , 11 Jan 1892 at Ingersoll.

009135-91 ( Oxford Co) Nicholas DUNN , 29 , farmer , North Oxford , same , s/o Michael DUNN & Catherine GAING? , married Maggie PICKARD , 23 , USA , North Oxford , d/o Elias PICKARD & Margaret O'NEIL both of Ingersoll , witn: John DUNN & Emma PICKARD both of Ingersoll , 15 April 1891 at Ingersoll. RC

#009558-89 (Oxford Co): John HENRY, 23, telegraph operator, Ingersoll, same, s/o Frank HENRY & Ann O'NEIL, married Agnes DUNN, 22, Ingersoll, same, d/o Michael DUNN & Catherine G--NG, witn: Nicholas & Margaret DUNN of N. Oxford, 7 Feb 1889 at Ingersoll (Rom Cath)

009524-89 ( Oxford Co) Henry McDERMOTT , 26 , farmer , North Oxford , Ingersoll , s/o Pat McDERMOTT & Mary LYNCH , married Kate DUNN , 24 , North Oxford , same , d/o Michael DUNN & Catherine GAING , witn: M. & Maggie DUNN of North Oxford , 28 Nov 1888 at Ingersoll. RC

1881 Census:
Michael DUNN M Male Irish 50 Ireland Farmer Catholic
Catharine DUNN M Female Irish 48 Ireland Catholic
Bridget DUNN Female Irish 22 O <Ontario> Catholic
Nicholas DUNN Male Irish 20 O <Ontario> Farmer Catholic
Catharine DUNN Female Irish 19 O <Ontario> Catholic
John DUNN Male Irish 18 O <Ontario> Farmer Catholic
Agnes DUNN Female Irish 16 O <Ontario> Catholic
Margaret DUNN Female Irish 13 O <Ontario> Catholic
Census Place Oxford North, Oxford South, Ontario
Family History Library Film 1375903
NA Film Number C-13267
District 165
Sub-district I
Division 1
Page Number 3
Household Number 12