Hi. I'm not related to this family.Here is a baptism for one child from the Quebec, Vital and Church Records (Drouin Collection), 1621-1967:
Napoleon Wilch, b. 7 Apr, bap 8 Apr 1849 Vaudreuil (St-Michel), son of Antoine dit Wilch & Emerentienne dite Marie Charles Brunet. -godparents- Antoine Brunet & Marie Louise Cann?
Here is their marriage:
Antoine dit Wilsch (no parents listed) m. 23 Jun 1845 Vaudreuil (St-Michel) Emerentienne dite Marie Charles Brunet (no parents listed)
I noticed in the 1851 Census that there was a Philippe Brunet, b. 1844 living with this family.This may be a baptism for him:
Philippe Bernard, illegitimate, b. 8 Oct, bap 14 Oct 1843 Vaudreuil (St-Michel) to parents unknown -godparents- Paschal Brunet & Marie Elizabeth Gauthier.
Sorry that's all I could find other than census data that you already have.Antoine may have died in 1883 according to this burial record:
Antoine Welsh, laborer of Hudson Vaudreuil, died on the 27th day of Sep 1883 and was buried 29 Sep 1883.
I did find an Antoine Welsh, age 60 (b. 1821) in the 1881 census, living in Vaudreuil as a widower & servant in the home of a Pyke family (James, a minister, & wife Catherine), one of whom (Mae L. Pyke) was present at his burial.Hope this helps. Annie