I was looking at the information you have on Max's profile. I'm having trouble following the names that you've got on it.
On his profile, you mention an 1880 census, which I assume is this one. This record lacks a son named Anthony, who according to the profile created for Anthony Grenier was born in 1873, so he should be in the census. There is an Albert in this census, but I'm unsure if they're one in the same - there's no evidence one way or another as of this moment, but if they are indeed one in the same, you should indicate such on Anthony's profile.
Next is his parents. While his presumed death record matches in terms of the year born (1833), his wife's name is given as Marie Desfries - is this an inaccurate transcription of a French name, or someone else altogether? Additionally, the mother on this record is given as Flovie, which is not a name I see listed on the profile you've created for Max or his presumed mother's profile.
Either way, a source for Max you should include is his Petition for Naturalization Index Card.
As for getting his birth certificate, your best bet is probably to get a copy of the baptismal certificate. I found an image on Ancestry that a user put up of his baptism. Baptism at Notre-Dame-du-Rosaire in Saint-Hyacinthe, Quebec; baptismal record 114; it's in the Drouin Collection on Ancestry, which you'll need an account to see.
To get a copy of his birth certificate, you'll need to look through the resources available on the Canadian government's website. His birth date is before 1900, so it will be a copy and/or transcribed record of his baptism.
Please make sure to add sources to the profiles you're working on, preferably from free resources like FamilySearch, so everyone who finds the profiles you make at a later date can follow along!