The declarations that are apparently needed to prove the genuity of a relationship, is it preferrable to have them made by friends or family?
I was thinking to include 1 declaration from a member of my family and from a member of my partner's family. Should I replace one of them with a declaration from a friend? Or just add a third one from a friend?
What is preferrable and what did other people do?

Also, our country specific instructions say that documentary evidence may include "notarized affidavits attesting to the fact and providing reasons for why you and your sponsor are/were living together without being married or unable to live together altogether". Is this similar to the statutory declaration of a common-law union? or is it advisable that I add something like this? Do I need to explain why we didn't get married?
Hi greenish
We included 3 notarized declarations from family members but also included about 8 un-notarized from friends and other family members.
The "notarized affidavits attesting to the fact and providing reasons for why you and your sponsor are/were living together without being married or unable to live together altogether" was not something we were asked to provide so can't advise you on that, but my thoughts are that this is different to the common law stat dec.
In our application we did included the common-law stat dec plus we both included a version of "our personal story" describing our relationship and how we met... and our plans for the future.
If I were you I would include everything they ask for and more!
Good luck
MDSB