Does he have a permanent residence that he's visiting you from, or is he temporarily without a permanent address (which would make your address as close to permanent as he has)?
If he's just away, he doesn't qualify to vote, since voting away from district ended on the 17th.
If its the latter, you and he should be able to swear an oath on the day of that he lives in the riding. (As I understand, if you can prove that you live in the poll, and you are willing to swear that he is who he says he is, and he lives there, then he can vote).
There's something supposedly from Luc Charbonneau at Elections Canada (his number is listed as 1-800-463-6868) from April 2002 on the web - sorry, linking is not working well for me right now:
Sections 8 and 9 of the Canada Elections Act provide the basis for determining an elector’s place of residence and, therefore, the polling division to which the elector’s vote will be attributed.
When a person has no permanent residence, the person’s temporary quarters at registration time are deemed to be the place where the person is ordinarily resident
Homeless electors may also register at the polls, subject to the usual requirements for satisfactory proof of identity and residence. Note, a homeless elector may also be vouched for, on oath, by another elector who is already on the list for the same polling division
The Chief Electoral Officer has previously defined satisfactory proof of identity and address as:
One piece of identification with the name, current address and signature of the elector;
Two pieces of identification:
One with the name and current address of the elector; and
A second piece with the name and signature of the elector;
A declaration confirming the name, address and signature of the elector, sworn under oath before a provincial officer authorized to accept oaths.
You can find the word document by googling "voting + Canada + homeless + oath" (its the first hit).
While your nephew may not be technically homeless, some of this will apply (not the ID aspect - he won't need a shelter list). A key fact will be if there is a provincial officer authorized to accept oaths at the polling station - that might be the kicker. You should probably phone and check, and if needed, TELL them the rules, and that they need to provide someone to take that oath, or face some angry, disenfranchised citizens.
**edited to add this, and fix the linking issue**
Actually, I'm not sure if the responsibility is on the govt to provide the person to swear the oath to, or if you need to deal with that in advance. But the simple "you can't vote without ID" is WRONG and potentially just laziness or misinformation.
OH! OH! Also, see the FAQ section on Election's Canada's site: here!
The: "Can a person who is homeless vote" is what you need.
[ 20 January 2006: Message edited by: swirrlygrrl ]