Yes, it's the parents who decide who their child is allowed to see. Sex however is legal when the child has reached age of consent. If it happens before that and the parents know, they can be charged for aiding to statutory rape. As a mother I would not let a 21yo date my 15yo child.
No you do not need consent if you are the legal parent.
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yes
If they have asked you to stay away, yes. As long as the child is a minor it's up to the parents. If you ask about sex the minor have to have reached age of consent in their state for it to be legal.
http://www.sexlaws.org/node/1353/print
Yes
The age of consent thing is you cannot sleep together or get married without parental consent. But, if you have parental consent, it's perfectly alright.
Probably not considering the age of consent is 16 in Indiana.
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