For those thinking about sponsoring in laws or putting wrong names on the intent form, take a look here
http://www.cic.gc.ca/english/resources/manuals/bulletins/2016/ob634.asp
"This invitation is not transferrable. The person who submitted the
Interest to sponsor form must be the sponsor or the application will not be accepted for processing.
...
All applications to sponsor a PGP must be sent to the CPC-M. Upon receipt of the application, CPC-M will verify that the person was invited to apply and that their information matches the associated information submitted on the web form. CPC-M must be satisfied that the person was invited to apply and that the information provided in the
Interest to sponsor form matches the information on the application and supporting documents."