they'll want this world income form here
http://www.cra-arc.gc.ca/E/pbg/tf/5013-sa/5013-sa-09e.pdf
and this one for the change of status
http://www.cra-arc.gc.ca/E/pbg/tf/5013-sa/5013-sa-09e.pdf
that should do it...
once he comes it gets a little more complicated and there's another form he must fill out for the time spent out of the country...
make sure to write a letter as explained the situation with your SIN number on it to accompany those forms...
http://www.cra-arc.gc.ca/E/pbg/tf/5013-sa/5013-sa-09e.pdf
and this one for the change of status
http://www.cra-arc.gc.ca/E/pbg/tf/5013-sa/5013-sa-09e.pdf
that should do it...
once he comes it gets a little more complicated and there's another form he must fill out for the time spent out of the country...
make sure to write a letter as explained the situation with your SIN number on it to accompany those forms...