i thing u should go for ielts, if it works, it is the best.
if u dont get desired marks, submit ur docs with claiming point, no need to mention that he is dead.
even if he were in pakistan at time of ur application, it doesn t make difference, cz he must be registered with some address in canada. and that will remain his address untill there record updated and mortaly is reported.
i think u shoud get adoptibily point as at time of ur application he was alived. cz i didnt read any thing concreate that say ur relative has to be alive at the time of processing or granting visa. yes he should be alive at the time of ur application, after word no one can give guarantee of life.
if any one of u has read somewhere solid about such case please give reference.