We will be in Canada for precisely 10 days to make our landing to get out PR card and then will be coming back to US and going back to Canada permanently say after 1 year. Is it a good idea to apply for OHIP and SIN while we are there for 10 days and just keep the cards ready. Or is it a necessity to have SIN or OHIP even if we are not there. If we don't get them will that create a problem later on?