Actually, most states I'm aware of, 14-year-olds can't marry, period. 16 with parental consent, 18 otherwise.
Actually, from what I'm reading, most states need not only parental consent, they need a court order for those under 16. This is usually given when the teen is pregnant or already has a child.
http://marriage.about.com/cs/teenmarriage/a/teenus.htm Common laws: The states that recognize them require a certain amount of time living as man and wife before recognizing it as a common law marriage -- usually 7 years. However, most states nowadays don't recognize them.
And for question 9, yes. Ew.