The "Guardians" thing is no longer an issue.
If you're between the age of 13 and 17, as long as you've turned in your parental permission slip, you can be in the convention space by yourself until midnight. At curfew, you must be in your hotel room, or on your way home.
If the person in question needing a guardian is age 12 or under, their parent or legal guardian must be a paid attendee and must be with them at all times.
And yes, by law, a person can have as many children as they want. Kumoricon can't stop them. ^_^
I kid.