mpapdp.1984 :
looks like they are asking you to submit the entire supporting documents !!! what have you submitted at first !!
Anyway, for the proof of relationship with your sister, the birth certificate cannot be changed to her husband's name, you need to translate the original birth certificate for you and her (certified translation) showing that you have at least one common parent.
Do not forget to submit proof that she is living in canada.
For the time frame, i have no idea, usually they specify the deadline for submitting the required documents in such letters.
Anyway, i have to say that you are really a lucky guy because they gave you a chance to submit all of those numerous documents, which they do not usually do. Usually they process the application as is (as received) especially if the number of missing documents was big as in your case.
Hurry up and submit the documents as soon as possible.
Good luck.