Well, a few of the tuition forms have my parent's address because I was too lazy to ever change some of the information (with five years of hindsight, not the best of ideas) but we have the T4s at least, and (for example) a study visa with that first address on it. But, we're really lacking on the joint finances, since our expenses are relatively limited (I don't have a cell phone, for example). Really it's just rent, which I paid in cash until about a year ago, power (which is in her name) and then things like groceries, which are shared, but for which one can't really conjure up evidence. We might have some evidence that she paid parts of my tuition, but I'm not sure what we have for that.
And we've never really bought things for the home, just been given things that people no longer wanted. We did give a number of Statutory Declarations, but not one for ourselves. So, we're getting that tonight. That, with the T4s, and resending the tenants insurance documentation (since that apparently wasn't on the list of proofs that they have for us, and yet it presumably would count as a separate item) seems like it ought to be enough, but then I assumed we were good previously, so I'm a little concerned.