Pippin, yes you are correct, you worded your sentence a lot better then myself!
Ryzriela, What I wanted to convey is that -if you only have 1,500 in your bank account, I think that this would be a red flag for the immigration officer as it shows you don't have strong financial ties/established in your country of residence, so you will need to provide stronger documents (such as a property lease).
You seem to have gathered all the necessary papers, and it doesn't hurt to keep your mother's letter with the papers.
As for your relatives in Canada , I don't think it matter if they hold a PR or citizenship , as long as they are willing to provide you will invitation letters.