as i already mention in Interest of sponsor form there is # of sponsored person , Family Name / year or birth must be filled. they have those information.So, if someone checked the boxes but they or their parents have given names/last names, how they ate going to provide yhe Exact information on the Application Form as IRCC said. Hence, they will not be condidered eligible.
IRCC advise not to submit duplicate:
If you successfully submitted the interest to sponsor form
After you successfully submitted the interest to sponsor form, you saw a page with your confirmation number. Keep this number for your records. You can use it later to check if you have been invited to apply.
We’ve also sent you an email to confirm that we’ve received your form.
You can’t modify the interest to sponsor form after you’ve submitted it. If you made a mistake on your interest to sponsor form, find out how to correct a mistake or update your information.